diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
new file mode 100644
index 0000000..0724c09
--- /dev/null
+++ b/.github/workflows/tests.yml
@@ -0,0 +1,14 @@
+name: CI
+on: push
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - uses: actions/setup-python@v1
+      with:
+        python-version: 3.8
+        architecture: x64
+    - run: pip install nox==2020.5.24
+    - run: pip install poetry==1.0.10
+    - run: nox
diff --git a/.gitignore b/.gitignore
index 47d1330..2e72e0b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
+.cache/
 *.egg-info/
 .python-version
 .venv/
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
new file mode 100644
index 0000000..cefbf7e
--- /dev/null
+++ b/.pre-commit-config.yaml
@@ -0,0 +1,38 @@
+default_stages: [commit]  # only used if a hook does not specify stages
+fail_fast: true
+repos:
+# Run the local formatting, linting, and testing tool chains.
+- repo: local
+  hooks:
+  - id: local-pre-commit-checks
+    name: Run code formatters and linters
+    entry: poetry run nox -s pre-commit --
+    language: system
+    stages: [commit]
+    types: [python]
+  - id: local-pre-merge-checks
+    name: Run the entire test suite
+    entry: poetry run nox -s pre-merge --
+    language: system
+    stages: [merge-commit, push]
+    types: [python]
+# Enable hooks provided by the pre-commit project to
+# enforce rules that local tools could not that easily.
+- repo: https://github.com/pre-commit/pre-commit-hooks
+  rev: v3.2.0
+  hooks:
+  - id: check-added-large-files
+    args: [--maxkb=100]
+  - id: check-case-conflict
+  - id: check-builtin-literals
+  - id: check-merge-conflict
+  - id: check-toml
+  - id: check-yaml
+  - id: end-of-file-fixer
+    stages: [commit]  # overwrite the default
+  - id: mixed-line-ending
+    args: [--fix=no]
+  - id: no-commit-to-branch
+    args: [--branch, main]
+  - id: trailing-whitespace
+    stages: [commit]  # overwrite the default
diff --git a/docs/conf.py b/docs/conf.py
new file mode 100644
index 0000000..2ab87a7
--- /dev/null
+++ b/docs/conf.py
@@ -0,0 +1,15 @@
+"""Configure sphinx."""
+
+import urban_meal_delivery as umd
+
+
+project = umd.__pkg_name__
+author = umd.__author__
+copyright = f'2020, {author}'  # pylint:disable=redefined-builtin
+version = release = umd.__version__
+
+extensions = [
+    'sphinx.ext.autodoc',
+    'sphinx.ext.napoleon',
+    'sphinx_autodoc_typehints',
+]
diff --git a/docs/index.rst b/docs/index.rst
new file mode 100644
index 0000000..87b8f19
--- /dev/null
+++ b/docs/index.rst
@@ -0,0 +1,95 @@
+Urban Meal Delivery
+===================
+
+.. toctree::
+   :hidden:
+   :maxdepth: 1
+
+   license
+   reference
+
+
+This is the documentation for the `urban-meal-delivery` package
+that contains all the source code
+used in a research project
+residing in this `repository`_.
+
+
+Prerequisites
+-------------
+
+Only `git`_, `Python`_ 3.8 and `poetry`_ must be available.
+All other software is automatically installed (cf., next section).
+
+
+Installation
+------------
+
+The `urban-meal-delivery` package is installed
+only after cloning the `repository`_.
+It is *not* available on `PyPI`_ via `pip`_.
+
+.. code-block:: console
+
+   $ git clone https://github.com/webartifex/urban-meal-delivery.git
+
+Use `poetry`_ to install the package
+with its dependencies into a `virtual environment`_,
+which we also refer to as the **local** or the **develop** environment here.
+
+.. code-block:: console
+
+   $ poetry install
+
+
+First Steps
+-----------
+
+Verify that the installation is in a good state by
+running the test suite and the code linters
+via the automated task runner `nox`_.
+
+``poetry run`` executes whatever comes after it in the develop environment.
+If you have a project-independent `nox`_ installation available,
+you may drop the ``poetry run`` prefix.
+Otherwise, `nox`_ was installed as a develop dependency in the `virtual environment`_
+in the installation step above.
+
+Run the default sessions in `nox`_:
+
+.. code-block:: console
+
+   $ [poetry run] nox
+
+`nox`_ provides many options.
+You can use them to choose among the different tasks you want to achieve.
+
+.. option:: -l, --list
+
+   List all available `nox`_ sessions.
+   This includes sessions that are *not* run by default
+   and that may be used as develop tools
+   to work on the source files.
+
+.. option:: -s [SESSION [SESSION ...]], --session[s] [SESSION [SESSION ...]]
+
+   Run only the specified session[s]
+
+.. option:: -r, --reuse-existing-virtualenvs
+
+   By default,
+   `nox`_ creates a new `virtual environment`_ for every session.
+   To speed things up,
+   one can re-use existing environments with the -r flag.
+   This should only be done when developing
+   and not before committing or on the CI server.
+
+
+.. _git: https://git-scm.com/
+.. _nox: https://nox.thea.codes/en/stable/
+.. _pip: https://pip.pypa.io/en/stable/
+.. _poetry: https://python-poetry.org/docs/
+.. _pypi: https://pypi.org/
+.. _python: https://docs.python.org/3/
+.. _repository: https://github.com/webartifex/urban-meal-delivery
+.. _virtual environment: https://docs.python.org/3/tutorial/venv.html
diff --git a/docs/license.rst b/docs/license.rst
new file mode 100644
index 0000000..8f93aa7
--- /dev/null
+++ b/docs/license.rst
@@ -0,0 +1,4 @@
+License
+=======
+
+.. include:: ../LICENSE.txt
diff --git a/docs/reference.rst b/docs/reference.rst
new file mode 100644
index 0000000..066d730
--- /dev/null
+++ b/docs/reference.rst
@@ -0,0 +1,6 @@
+Reference
+=========
+
+.. contents::
+    :local:
+    :backlinks: none
diff --git a/noxfile.py b/noxfile.py
new file mode 100644
index 0000000..96cb2f8
--- /dev/null
+++ b/noxfile.py
@@ -0,0 +1,439 @@
+"""Configure nox as the task runner, including CI and pre-commit hooks.
+
+Generic maintainance tasks:
+
+- "init-project": set up the pre-commit hooks
+
+- "clean-pwd": ~ `git clean -X` with minor exceptions
+
+
+For local development, use the "format", "lint", and "test" sessions
+as unified tasks to assure the quality of the source code:
+
+- "format" (autoflake, black, isort):
+
+  + check all source files [default]
+  + accept extra arguments, e.g., `poetry run nox -s format -- noxfile.py`,
+    that are then interpreted as the paths the formatters and linters work
+    on recursively
+
+- "lint" (flake8, mypy, pylint): same as "format"
+
+- "test" (pytest, xdoctest):
+
+  + run the entire test suite [default]
+  + accepts extra arguments, e.g., `poetry run nox -s test -- --no-cov`,
+    that are passed on to `pytest` and `xdoctest` with no changes
+    => may be paths or options
+
+
+GitHub Actions implements a CI workflow:
+
+- "format", "lint", and "test" as above
+
+- "safety": check if dependencies contain known security vulnerabilites
+
+- "docs": build the documentation with sphinx
+
+
+The pre-commit framework invokes the "pre-commit" and "pre-merge" sessions:
+
+- "pre-commit" before all commits:
+
+  + triggers "format" and "lint" on staged source files
+  + => test coverage may be < 100%
+
+- "pre-merge" before all merges and pushes:
+
+  + same as "pre-commit"
+  + plus: triggers "test", "safety", and "docs" (that ignore extra arguments)
+  + => test coverage is enforced to be 100%
+
+"""
+
+import contextlib
+import glob
+import os
+import tempfile
+
+import nox
+from nox.sessions import Session
+
+
+PACKAGE_IMPORT_NAME = 'urban_meal_delivery'
+
+# Docs/sphinx locations.
+DOCS_SRC = 'docs/'
+DOCS_BUILD = '.cache/docs/'
+
+# Path to the *.py files to be packaged.
+PACKAGE_SOURCE_LOCATION = 'src/'
+
+# Path to the test suite.
+PYTEST_LOCATION = 'tests/'
+
+# Paths with all *.py files.
+SRC_LOCATIONS = (
+    f'{DOCS_SRC}/conf.py',
+    'noxfile.py',
+    PACKAGE_SOURCE_LOCATION,
+    PYTEST_LOCATION,
+)
+
+PYTHON = '3.8'
+
+# Use a unified .cache/ folder for all tools.
+nox.options.envdir = '.cache/nox'
+
+# All tools except git and poetry are project dependencies.
+# Avoid accidental successes if the environment is not set up properly.
+nox.options.error_on_external_run = True
+
+# Run only CI related checks by default.
+nox.options.sessions = (
+    'format',
+    'lint',
+    'test',
+    'safety',
+    'docs',
+)
+
+
+@nox.session(name='format', python=PYTHON)
+def format_(session):
+    """Format source files with autoflake, black, and isort.
+
+    If no extra arguments are provided, all source files are formatted.
+    Otherwise, they are interpreted as paths the formatters work on recursively.
+    """
+    _begin(session)
+
+    # The formatting tools do not require the developed
+    # package be installed in the virtual environment.
+    _install_packages(session, 'autoflake', 'black', 'isort')
+
+    # Interpret extra arguments as locations of source files.
+    locations = session.posargs or SRC_LOCATIONS
+
+    session.run('autoflake', '--version')
+    session.run(
+        'autoflake',
+        '--in-place',
+        '--recursive',
+        '--expand-star-imports',
+        '--remove-all-unused-imports',
+        '--ignore-init-module-imports',  # modifies --remove-all-unused-imports
+        '--remove-duplicate-keys',
+        '--remove-unused-variables',
+        *locations,
+    )
+
+    session.run('black', '--version')
+    session.run('black', *locations)
+
+    with _isort_fix(session):  # TODO (isort): Remove after upgrading
+        session.run('isort', '--version')
+        session.run('isort', *locations)
+
+
+@nox.session(python=PYTHON)
+def lint(session):
+    """Lint source files with flake8, mypy, and pylint.
+
+    If no extra arguments are provided, all source files are linted.
+    Otherwise, they are interpreted as paths the linters work on recursively.
+    """
+    _begin(session)
+
+    # The linting tools do not require the developed
+    # package be installed in the virtual environment.
+    _install_packages(
+        session,
+        'flake8',
+        'flake8-annotations',
+        'flake8-black',
+        'flake8-expression-complexity',
+        'flake8-pytest-style',
+        'mypy',
+        'pylint',
+        'wemake-python-styleguide',
+    )
+
+    # Interpret extra arguments as locations of source files.
+    locations = session.posargs or SRC_LOCATIONS
+
+    session.run('flake8', '--version')
+    session.run('flake8', '--ignore=I0', *locations)  # TODO (isort): Remove flag
+
+    with _isort_fix(session):  # TODO (isort): Remove after upgrading
+        session.run('isort', '--version')
+        session.run('isort', '--check-only', *locations)
+
+    # For mypy, only lint *.py files to be packaged.
+    mypy_locations = [
+        path for path in locations if path.startswith(PACKAGE_SOURCE_LOCATION)
+    ]
+    if mypy_locations:
+        session.run('mypy', '--version')
+        session.run('mypy', *mypy_locations)
+    else:
+        session.log('No paths to be checked with mypy')
+
+    # Ignore errors where pylint cannot import a third-party package due its
+    # being run in an isolated environment. For the same reason, pylint is
+    # also not able to determine the correct order of imports.
+    # One way to fix this is to install all develop dependencies in this nox
+    # session, which we do not do. The whole point of static linting tools is
+    # to not rely on any package be importable at runtime. Instead, these
+    # imports are validated implicitly when the test suite is run.
+    session.run('pylint', '--version')
+    session.run(
+        'pylint', '--disable=import-error', '--disable=wrong-import-order', *locations,
+    )
+
+
+@nox.session(name='pre-commit', python=PYTHON, venv_backend='none')
+def pre_commit(session):
+    """Run the format and lint sessions.
+
+    Source files must be well-formed before they enter git.
+
+    Intended to be run as a pre-commit hook.
+
+    Passed in extra arguments are forwarded. So, if it is run as a pre-commit
+    hook, only the currently staged source files are formatted and linted.
+    """
+    # "format" and "lint" are run in sessions on their own as
+    # session.notify() creates new Session objects.
+    session.notify('format')
+    session.notify('lint')
+
+
+@nox.session(python=PYTHON)
+def test(session):
+    """Test the code base.
+
+    Runs the unit and integration tests with pytest and
+    validate that all code snippets in docstrings work with xdoctest.
+
+    If no extra arguments are provided, the entire test suite
+    is exexcuted and succeeds only with 100% coverage.
+
+    If extra arguments are provided, they are
+    forwarded to pytest and xdoctest without any changes.
+    xdoctest ignores arguments it does not understand.
+    """
+    # Re-using an old environment is not so easy here as
+    # `poetry install --no-dev` removes previously installed packages.
+    # We keep things simple and forbid such usage.
+    if session.virtualenv.reuse_existing:
+        raise RuntimeError('The "test" session must be run without the "-r" option')
+
+    _begin(session)
+
+    # The testing tools require the developed package and its
+    # non-develop dependencies be installed in the virtual environment.
+    session.run('poetry', 'install', '--no-dev', external=True)
+    _install_packages(
+        session, 'packaging', 'pytest', 'pytest-cov', 'xdoctest[optional]',
+    )
+
+    # Interpret extra arguments as options for pytest.
+    # They are "dropped" by the hack in the pre_merge() function
+    # if this function is run within the "pre-merge" session.
+    posargs = () if session.env.get('_drop_posargs') else session.posargs
+
+    args = posargs or (
+        '--cov',
+        '--no-cov-on-fail',
+        '--cov-branch',
+        '--cov-fail-under=100',
+        '--cov-report=term-missing:skip-covered',
+        PYTEST_LOCATION,
+    )
+    session.run('pytest', '--version')
+    session.run('pytest', *args)
+
+    # For xdoctest, the default arguments are different from pytest.
+    args = posargs or [PACKAGE_IMPORT_NAME]
+    session.run('xdoctest', '--version')
+    session.run('xdoctest', '--quiet', *args)  # --quiet => less verbose output
+
+
+@nox.session(python=PYTHON)
+def safety(session):
+    """Check the dependencies for known security vulnerabilities."""
+    _begin(session)
+
+    # We do not pin the version of `safety` to always check with
+    # the latest version. The risk this breaks the CI is rather low.
+    session.install('safety')
+
+    with tempfile.NamedTemporaryFile() as requirements_txt:
+        session.run(
+            'poetry',
+            'export',
+            '--dev',
+            '--format=requirements.txt',
+            f'--output={requirements_txt.name}',
+            external=True,
+        )
+        session.run(
+            'safety', 'check', f'--file={requirements_txt.name}', '--full-report',
+        )
+
+
+@nox.session(python=PYTHON)
+def docs(session):
+    """Build the documentation with sphinx."""
+    # The latest version of the package needs to be installed
+    # so that sphinx's autodoc can include the latest docstrings.
+    if session.virtualenv.reuse_existing:
+        raise RuntimeError('The "docs" session must be run without the "-r" option')
+
+    _begin(session)
+
+    # The documentation tools require the developed package and its
+    # non-develop dependencies be installed in the virtual environment.
+    # Otherwise, sphinx's autodoc could not include the docstrings.
+    session.run('poetry', 'install', '--no-dev', external=True)
+    _install_packages(session, 'sphinx', 'sphinx-autodoc-typehints')
+
+    session.run('sphinx-build', DOCS_SRC, DOCS_BUILD)
+    # Verify all external links return 200 OK.
+    session.run('sphinx-build', '-b', 'linkcheck', DOCS_SRC, DOCS_BUILD)
+
+    print(f'Docs are available at {os.getcwd()}/{DOCS_BUILD}index.html')  # noqa:WPS421
+
+
+@nox.session(name='pre-merge', python=PYTHON)
+def pre_merge(session):
+    """Run the format, lint, test, safety, and docs sessions.
+
+    Intended to be run either as a pre-merge or pre-push hook.
+
+    Ignores the paths passed in by the pre-commit framework
+    for the test, safety, and docs sessions so that the
+    entire test suite is executed.
+    """
+    # Re-using an old environment is not so easy here as the "test" session
+    # runs `poetry install --no-dev`, which removes previously installed packages.
+    if session.virtualenv.reuse_existing:
+        raise RuntimeError(
+            'The "pre-merge" session must be run without the "-r" option',
+        )
+
+    session.notify('format')
+    session.notify('lint')
+    session.notify('safety')
+    session.notify('docs')
+
+    # Little hack to not work with the extra arguments provided
+    # by the pre-commit framework. Create a flag in the
+    # env(ironment) that must contain only `str`-like objects.
+    session.env['_drop_posargs'] = 'true'
+
+    # Cannot use session.notify() to trigger the "test" session
+    # as that would create a new Session object without the flag
+    # in the env(ironment). Instead, run the test() function within
+    # the "pre-merge" session.
+    test(session)
+
+
+@nox.session(name='init-project', python=PYTHON, venv_backend='none')
+def init_project(session):
+    """Install the pre-commit hooks."""
+    for type_ in ('pre-commit', 'pre-merge-commit', 'pre-push'):
+        session.run('poetry', 'run', 'pre-commit', 'install', f'--hook-type={type_}')
+
+
+@nox.session(name='clean-pwd', python=PYTHON, venv_backend='none')
+def clean_pwd(session):
+    """Remove (almost) all glob patterns listed in .gitignore.
+
+    The difference compared to `git clean -X` is that this task
+    does not remove pyenv's .python-version file and poetry's
+    virtual environment.
+    """
+    exclude = frozenset(('.python-version', '.venv', 'venv'))
+
+    with open('.gitignore') as file_handle:
+        paths = file_handle.readlines()
+
+    for path in paths:
+        path = path.strip()
+        if path.startswith('#') or path in exclude:
+            continue
+
+        for expanded in glob.glob(path):
+            session.run(f'rm -rf {expanded}')
+
+
+def _begin(session):
+    """Show generic info about a session."""
+    if session.posargs:
+        # Part of the hack in pre_merge() to "drop" the extra arguments.
+        # Indicate to stdout that the passed in extra arguments are ignored.
+        if session.env.get('_drop_posargs') is None:
+            print('Provided extra argument(s):', *session.posargs)  # noqa:WPS421
+        else:
+            print('The provided extra arguments are ignored')  # noqa:WPS421
+
+    session.run('python', '--version')
+
+    # Fake GNU's pwd.
+    session.log('pwd')
+    print(os.getcwd())  # noqa:WPS421
+
+
+def _install_packages(session: Session, *packages_or_pip_args: str, **kwargs) -> None:
+    """Install packages respecting the poetry.lock file.
+
+    This function wraps nox.sessions.Session.install() such that it installs
+    packages respecting the pinnned versions specified in poetry's lock file.
+    This makes nox sessions even more deterministic.
+
+    IMPORTANT: This function skips installation if the current nox session
+    is run with the "-r" flag to re-use an existing virtual environment.
+    That turns nox into a fast task runner provided that a virtual
+    environment actually existed and does not need to be changed (e.g.,
+    new dependencies added in the meantime). Do not use the "-r" flag on CI
+    or as part of pre-commit hooks!
+
+    Args:
+        session: the Session object
+        *packages_or_pip_args: the packages to be installed or pip options
+        **kwargs: passed on to nox.sessions.Session.install()
+    """  # noqa:RST210,RST213
+    if session.virtualenv.reuse_existing:
+        session.log(
+            'No dependencies are installed as an existing environment is re-used',
+        )
+        return
+
+    session.log('Dependencies are installed respecting the poetry.lock file')
+
+    with tempfile.NamedTemporaryFile() as requirements_txt:
+        session.run(
+            'poetry',
+            'export',
+            '--dev',
+            '--format=requirements.txt',
+            f'--output={requirements_txt.name}',
+            external=True,
+        )
+        session.install(
+            f'--constraint={requirements_txt.name}', *packages_or_pip_args, **kwargs,
+        )
+
+
+# TODO (isort): Remove this fix after
+# upgrading to isort ^5.3.0 in pyproject.toml.
+@contextlib.contextmanager
+def _isort_fix(session):
+    """Temporarily upgrade to isort 5.3.0."""
+    session.install('isort==5.3.0')
+    try:
+        yield
+    finally:
+        session.install('isort==4.3.21')
diff --git a/poetry.lock b/poetry.lock
index b9e1c09..195fcc9 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,8 +1,1678 @@
-package = []
+[[package]]
+category = "dev"
+description = "A configurable sidebar-enabled Sphinx theme"
+name = "alabaster"
+optional = false
+python-versions = "*"
+version = "0.7.12"
+
+[[package]]
+category = "dev"
+description = "A small Python module for determining appropriate platform-specific dirs, e.g. a \"user data dir\"."
+name = "appdirs"
+optional = false
+python-versions = "*"
+version = "1.4.4"
+
+[[package]]
+category = "dev"
+description = "Bash tab completion for argparse"
+name = "argcomplete"
+optional = false
+python-versions = "*"
+version = "1.12.0"
+
+[package.extras]
+test = ["coverage", "flake8", "pexpect", "wheel"]
+
+[[package]]
+category = "dev"
+description = "Read/rewrite/write Python ASTs"
+name = "astor"
+optional = false
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,>=2.7"
+version = "0.8.1"
+
+[[package]]
+category = "dev"
+description = "Pretty print the output of python stdlib `ast.parse`."
+name = "astpretty"
+optional = false
+python-versions = ">=3.6.1"
+version = "2.0.0"
+
+[package.extras]
+typed = ["typed-ast"]
+
+[[package]]
+category = "dev"
+description = "An abstract syntax tree for Python with inference support."
+name = "astroid"
+optional = false
+python-versions = ">=3.5"
+version = "2.4.2"
+
+[package.dependencies]
+lazy-object-proxy = ">=1.4.0,<1.5.0"
+six = ">=1.12,<2.0"
+wrapt = ">=1.11,<2.0"
+
+[[package]]
+category = "dev"
+description = "Atomic file writes."
+marker = "sys_platform == \"win32\""
+name = "atomicwrites"
+optional = false
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+[[package]]
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+
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+
+[package.dependencies]
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+[[package]]
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+
+[package.dependencies]
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+[[package]]
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+
+[package.dependencies]
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+[package.extras]
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+
+[[package]]
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+description = "Python package for providing Mozilla's CA Bundle."
+name = "certifi"
+optional = false
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+
+[[package]]
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+name = "cfgv"
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+
+[[package]]
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+name = "chardet"
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+
+[[package]]
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+marker = "sys_platform == \"win32\" or platform_system == \"Windows\" or platform_system == \"Windows\""
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+[package.dependencies]
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+[[package]]
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+[[package]]
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+[[package]]
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+name = "eradicate"
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+
+[[package]]
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+description = "A platform independent file lock."
+name = "filelock"
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+
+[[package]]
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+
+[[package]]
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+
+[package.dependencies]
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+[[package]]
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+name = "flake8-bandit"
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+
+[package.dependencies]
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+[[package]]
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+
+[package.dependencies]
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+[[package]]
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+name = "flake8-broken-line"
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+[package.dependencies]
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+[[package]]
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+name = "flake8-bugbear"
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+
+[package.dependencies]
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+[[package]]
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+[package.dependencies]
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+[package.dependencies]
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+[package.dependencies]
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+[[package]]
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+
+[package.dependencies]
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+[[package]]
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+
+[package.dependencies]
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+[[package]]
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+name = "flake8-expression-complexity"
+optional = false
+python-versions = ">=3.6"
+version = "0.0.8"
+
+[package.dependencies]
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+[[package]]
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+name = "flake8-isort"
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+[package.dependencies]
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+[package.dependencies.isort]
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+[package.extras]
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+
+[[package]]
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+[package.dependencies]
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+[[package]]
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+name = "flake8-pytest-style"
+optional = false
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+
+[package.dependencies]
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+
+[[package]]
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+name = "flake8-quotes"
+optional = false
+python-versions = "*"
+version = "2.1.2"
+
+[package.dependencies]
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+
+[[package]]
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+name = "flake8-rst-docstrings"
+optional = false
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+
+[package.dependencies]
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+[[package]]
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+name = "flake8-string-format"
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+
+[package.dependencies]
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+[[package]]
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+name = "gitdb"
+optional = false
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+
+[package.dependencies]
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+[[package]]
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+description = "Python Git Library"
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+version = "3.1.7"
+
+[package.dependencies]
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+
+[[package]]
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+description = "File identification library for Python"
+name = "identify"
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+
+[package.extras]
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+
+[[package]]
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+description = "Internationalized Domain Names in Applications (IDNA)"
+name = "idna"
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+version = "2.10"
+
+[[package]]
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+name = "imagesize"
+optional = false
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+version = "1.2.0"
+
+[[package]]
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+name = "iniconfig"
+optional = false
+python-versions = "*"
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+
+[[package]]
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+description = "A Python utility / library to sort Python imports."
+name = "isort"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "4.3.21"
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+[package.extras]
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+xdg_home = ["appdirs (>=1.4.0)"]
+
+[[package]]
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+name = "jinja2"
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+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
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+[package.dependencies]
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+
+[package.extras]
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+[[package]]
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+name = "lazy-object-proxy"
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+version = "1.4.3"
+
+[[package]]
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+name = "markupsafe"
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+[[package]]
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+[[package]]
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+name = "more-itertools"
+optional = false
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+
+[[package]]
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+version = "0.782"
+
+[package.dependencies]
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+[package.extras]
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+[[package]]
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+name = "mypy-extensions"
+optional = false
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+
+[[package]]
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+description = "Node.js virtual environment builder"
+name = "nodeenv"
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+
+[[package]]
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+description = "Flexible test automation."
+name = "nox"
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+
+[package.dependencies]
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+[package.extras]
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+[[package]]
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+name = "packaging"
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+[package.dependencies]
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+[[package]]
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+[package.dependencies]
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+[[package]]
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+[package.extras]
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+[[package]]
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+[[package]]
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+[[package]]
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+name = "pydocstyle"
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+version = "5.0.2"
+
+[package.dependencies]
+snowballstemmer = "*"
+
+[[package]]
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+name = "pyflakes"
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+
+[[package]]
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+name = "pygments"
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+
+[[package]]
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+[package.dependencies]
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+[[package]]
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+version = "2.4.7"
+
+[[package]]
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+description = "pytest: simple powerful testing with Python"
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+[package.extras]
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+[[package]]
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+[package.extras]
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+[[package]]
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+name = "pytz"
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+version = "2020.1"
+
+[[package]]
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+description = "YAML parser and emitter for Python"
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+name = "regex"
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+version = "2020.7.14"
+
+[[package]]
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+description = "Python HTTP for Humans."
+name = "requests"
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+version = "2.24.0"
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+
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+]
+wemake-python-styleguide = [
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+    {file = "wemake_python_styleguide-0.14.1-py3-none-any.whl", hash = "sha256:73a501e0547275287a2b926515c000cc25026a8bceb9dcc1bf73ef85a223a3c6"},
+]
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+    {file = "wrapt-1.12.1.tar.gz", hash = "sha256:b62ffa81fb85f4332a4f609cab4ac40709470da05643a082ec1eb88e6d9b97d7"},
+]
+xdoctest = [
+    {file = "xdoctest-0.13.0-py2.py3-none-any.whl", hash = "sha256:de861fd5230a46bd26c054b4981169dd963f813768cb62b62e104e4d2644ac94"},
+    {file = "xdoctest-0.13.0.tar.gz", hash = "sha256:4f113a430076561a9d7f31af65b5d5acda62ee06b05cb6894264cb9efb8196ac"},
+]
diff --git a/pyproject.toml b/pyproject.toml
index eb24353..7981fc3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -2,9 +2,14 @@
 build-backend = "poetry.masonry.api"
 requires = ["poetry>=0.12"]
 
+[tool.black]
+line-length = 88
+skip-string-normalization = true  # wemake-python-styleguide enforces single quotes
+target-version = ["py38"]
+
 [tool.poetry]
 name = "urban-meal-delivery"
-version = "0.1.0.dev0"
+version = "0.1.0"
 
 authors = ["Alexander Hess <alexander@webartifex.biz>"]
 description = "Optimizing an urban meal delivery platform"
@@ -22,4 +27,37 @@ repository = "https://github.com/webartifex/urban-meal-delivery"
 [tool.poetry.dependencies]
 python = "^3.8"
 
+click = "^7.1.2"
+
 [tool.poetry.dev-dependencies]
+# Task Runners
+nox = "^2020.5.24"
+pre-commit = "^2.6.0"
+
+# Code Formatters
+autoflake = "^1.3.1"
+black = "^19.10b0"
+isort = "^4.3.21"  # TODO (isort): not ^5.2.2 due to pylint and wemake-python-styleguide
+
+# (Static) Code Analyzers
+flake8 = "^3.8.3"
+flake8-annotations = "^2.3.0"
+flake8-black = "^0.2.1"
+flake8-expression-complexity = "^0.0.8"
+flake8-pytest-style = "^1.2.2"
+mypy = "^0.782"
+pylint = "^2.5.3"
+wemake-python-styleguide = "^0.14.1"  # flake8 plug-in
+
+# Test Suite
+packaging = "^20.4"  # used to test the packaged version
+pytest = "^6.0.1"
+pytest-cov = "^2.10.0"
+xdoctest = { version="^0.13.0", extras=["optional"] }
+
+# Documentation
+sphinx = "^3.1.2"
+sphinx-autodoc-typehints = "^1.11.0"
+
+[tool.poetry.scripts]
+umd = "urban_meal_delivery.console:main"
diff --git a/setup.cfg b/setup.cfg
new file mode 100644
index 0000000..3e1b9bf
--- /dev/null
+++ b/setup.cfg
@@ -0,0 +1,231 @@
+[black]
+# black's settings are in pyproject.toml => [tool.black]
+
+
+[coverage:paths]
+source =
+    src/
+    */site-packages/
+
+[coverage:report]
+show_missing = true
+skip_covered = true
+skip_empty = true
+
+[coverage:run]
+branch = true
+data_file = .cache/coverage/data
+source =
+    urban_meal_delivery
+
+
+[flake8]
+# Include error classes only explicitly
+# to avoid forward compatibility issues.
+select =
+    # =============
+    # flake8's base
+    # =============
+    # mccabe => cyclomatic complexity
+    C901,
+    # pycodestyle => PEP8 compliance
+    E, W,
+    # pyflakes => basic errors
+    F4, F5, F6, F7, F8, F9
+    # ========================
+    # wemake-python-styleguide
+    # Source: https://wemake-python-stylegui.de/en/latest/pages/usage/violations/index.html
+    # ========================
+    WPS1, WPS2, WPS3, WPS4, WPS5, WPS6,
+    # darglint => docstring matches implementation
+    DAR0, DAR1, DAR2, DAR3, DAR4, DAR5,
+    # flake8-bandit => common security issues
+    S1, S2, S3, S4, S5, S6, S7,
+    # flake8-broken-line => no \ to end a line
+    N400,
+    # flake8-bugbear => opinionated bugs and design flaws
+    B0, B3, B9,
+    # flake8-commas => better comma placements
+    C8,
+    # flake8-comprehensions => better comprehensions
+    C4,
+    # flake8-debugger => no debugger usage
+    T100,
+    # flake8-docstrings => PEP257 compliance
+    D1, D2, D3, D4,
+    # flake8-eradicate => no commented out code
+    E800,
+    # flake8-isort => isort would make changes
+    I0,
+    # flake8-rst-docstrings => valid rst in docstrings
+    RST2, RST3, RST4,
+    # flake8-string-format => unify usage of str.format()
+    P1, P2, P3,
+    # flake8-quotes => use double quotes everywhere (complying with black)
+    Q0,
+    # pep8-naming
+    N8,
+    # =====
+    # other
+    # =====
+    # flake8-annotations => enforce type checking for functions
+    ANN0, ANN2, ANN3,
+    # flake8-black => complain if black would make changes
+    BLK1, BLK9,
+    # flake8-expression-complexity => not too many expressions at once
+    ECE001,
+    # flake8-pytest-style => enforce a consistent style with pytest
+    PT0,
+
+# By default, flake8 ignores some errors.
+# Instead, do not ignore anything.
+ignore =
+
+# If --ignore is passed on the command
+# line, still ignore the following:
+extend-ignore =
+    # Comply with black's style.
+    # Source: https://github.com/psf/black/blob/master/docs/compatible_configs.md#flake8
+    E203, W503,
+    # f-strings are ok.
+    WPS305,
+    # Classes should not have to specify a base class.
+    WPS306,
+    # Putting logic into __init__.py files may be justified.
+    WPS412,
+    # Allow multiple assignment, e.g., x = y = 123
+    WPS429,
+
+per-file-ignores =
+    docs/conf.py:
+        # Allow shadowing built-ins and reading __*__ variables.
+        WPS125,WPS609,
+    noxfile.py:
+        # Type annotations are not strictly enforced.
+        ANN0, ANN2,
+        # TODO (isort): Check if still too many module members.
+        WPS202,
+        # TODO (isort): Remove after simplifying the nox session "lint".
+        WPS213,
+        # No overuse of string constants (e.g., '--version').
+        WPS226,
+    tests/*.py:
+        # Type annotations are not strictly enforced.
+        ANN0, ANN2,
+        # `assert` statements are ok in the test suite.
+        S101,
+        # Shadowing outer scopes occurs naturally with mocks.
+        WPS442,
+        # No overuse of string constants (e.g., '__version__').
+        WPS226,
+
+# Explicitly set mccabe's maximum complexity to 10 as recommended by
+# Thomas McCabe, the inventor of the McCabe complexity, and the NIST.
+# Source: https://en.wikipedia.org/wiki/Cyclomatic_complexity#Limiting_complexity_during_development
+max-complexity = 10
+
+# Comply with black's style.
+# Source: https://github.com/psf/black/blob/master/docs/the_black_code_style.md#line-length
+max-line-length = 88
+
+# Preview the code lines that cause errors.
+show-source = true
+
+# ===================================
+# wemake-python-styleguide's settings
+# ===================================
+allowed-domain-names =
+    param,
+    result,
+    value,
+min-name-length = 3
+max-name-length = 40
+# darglint
+strictness = long
+# flake8-docstrings
+docstring-convention = google
+# flake8-eradicate
+eradicate-aggressive = true
+
+# ==============================
+# flake8-pytest-style's settings
+# ==============================
+# Prefer @pytest.fixture over @pytest.fixture().
+pytest-fixture-no-parentheses = true
+# Prefer @pytest.mark.parametrize(['param1', 'param2'], [(1, 2), (3, 4)])
+# over @pytest.mark.parametrize(('param1', 'param2'), ([1, 2], [3, 4]))
+pytest-parametrize-names-type = list
+pytest-parametrize-values-row-type = tuple
+pytest-parametrize-values-type = list
+
+
+[isort]
+atomic = true
+case_sensitive = true
+combine_star = true
+force_alphabetical_sort_within_sections = true
+lines_after_imports = 2
+remove_redundant_aliases = true
+
+# Comply with black's style.
+# Source: https://github.com/psf/black/blob/master/docs/compatible_configs.md#isort
+ensure_newline_before_comments = true
+force_grid_wrap = 0
+include_trailing_comma = true
+line_length = 88
+multi_line_output = 3
+use_parentheses = true
+
+# Comply with Google's Python Style Guide.
+# All imports go on a single line except the ones from the typing module.
+# Source: https://google.github.io/styleguide/pyguide.html#313-imports-formatting
+force_single_line = true
+single_line_exclusions = typing
+
+
+[mypy]
+cache_dir = .cache/mypy
+
+[mypy-nox.*,packaging,pytest]
+ignore_missing_imports = true
+
+
+[pylint.FORMAT]
+# Comply with black's style.
+max-line-length = 88
+
+[pylint.MESSAGES CONTROL]
+disable =
+    # We use TODO's to indicate locations in the source base
+    # that must be worked on in the near future.
+    fixme,
+    # Comply with black's style.
+    bad-continuation, bad-whitespace,
+    # =====================
+    # flake8 de-duplication
+    # Source: https://pylint.pycqa.org/en/latest/faq.html#i-am-using-another-popular-linter-alongside-pylint-which-messages-should-i-disable-to-avoid-duplicates
+    # =====================
+    # mccabe
+    too-many-branches,
+    # pep8-naming
+    bad-classmethod-argument, bad-mcs-classmethod-argument,
+    invalid-name, no-self-argument,
+    # pycodestyle
+    bad-indentation, bare-except, line-too-long, missing-final-newline,
+    multiple-statements, trailing-whitespace, unnecessary-semicolon, unneeded-not,
+    # pydocstyle
+    missing-class-docstring, missing-function-docstring, missing-module-docstring,
+    # pyflakes
+    undefined-variable, unused-import, unused-variable,
+    # wemake-python-styleguide
+    redefined-outer-name,
+
+[pylint.REPORTS]
+score = no
+
+
+[tool:pytest]
+addopts =
+    --strict-markers
+cache_dir = .cache/pytest
+console_output_style = count
diff --git a/src/urban_meal_delivery/__init__.py b/src/urban_meal_delivery/__init__.py
index 27023c3..d130f04 100644
--- a/src/urban_meal_delivery/__init__.py
+++ b/src/urban_meal_delivery/__init__.py
@@ -1 +1,23 @@
-"""Source code for the urban-meal-delivery research project."""
+"""Source code for the urban-meal-delivery research project.
+
+Example:
+    >>> import urban_meal_delivery as umd
+    >>> umd.__version__ != '0.0.0'
+    True
+"""
+
+from importlib import metadata as _metadata
+
+
+try:
+    _pkg_info = _metadata.metadata(__name__)
+
+except _metadata.PackageNotFoundError:  # pragma: no cover
+    __author__ = 'unknown'
+    __pkg_name__ = 'unknown'
+    __version__ = 'unknown'
+
+else:
+    __author__ = _pkg_info['author']
+    __pkg_name__ = _pkg_info['name']
+    __version__ = _pkg_info['version']
diff --git a/src/urban_meal_delivery/console.py b/src/urban_meal_delivery/console.py
new file mode 100644
index 0000000..0141370
--- /dev/null
+++ b/src/urban_meal_delivery/console.py
@@ -0,0 +1,37 @@
+"""Provide CLI scripts for the project."""
+
+from typing import Any
+
+import click
+from click.core import Context
+
+import urban_meal_delivery
+
+
+def show_version(ctx: Context, _param: Any, value: bool) -> None:
+    """Show the package's version."""
+    # If --version / -V is NOT passed in,
+    # continue with the command.
+    if not value or ctx.resilient_parsing:
+        return
+
+    # Mimic the colors of `poetry version`.
+    pkg_name = click.style(urban_meal_delivery.__pkg_name__, fg='green')  # noqa:WPS609
+    version = click.style(urban_meal_delivery.__version__, fg='blue')  # noqa:WPS609
+    # Include a warning for development versions.
+    warning = click.style(' (development)', fg='red') if '.dev' in version else ''
+    click.echo(f'{pkg_name}, version {version}{warning}')
+    ctx.exit()
+
+
+@click.command()
+@click.option(
+    '--version',
+    '-V',
+    is_flag=True,
+    callback=show_version,
+    is_eager=True,
+    expose_value=False,
+)
+def main() -> None:
+    """The urban-meal-delivery research project."""
diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000..606a650
--- /dev/null
+++ b/tests/__init__.py
@@ -0,0 +1 @@
+"""Test the urban-meal-delivery package."""
diff --git a/tests/test_console.py b/tests/test_console.py
new file mode 100644
index 0000000..00c721f
--- /dev/null
+++ b/tests/test_console.py
@@ -0,0 +1,110 @@
+"""Test the package's `umd` command-line client."""
+
+import click
+import pytest
+from click import testing as click_testing
+
+from urban_meal_delivery import console
+
+
+class TestShowVersion:
+    """Test console.show_version().
+
+    The function is used as a callback to a click command option.
+
+    show_version() prints the name and version of the installed package to
+    stdout. The output looks like this: "{pkg_name}, version {version}".
+
+    Development (= non-final) versions are indicated by appending a
+    " (development)" to the output.
+    """
+
+    # pylint:disable=no-self-use
+
+    @pytest.fixture
+    def ctx(self) -> click.Context:
+        """Context around the console.main Command."""
+        return click.Context(console.main)
+
+    def test_no_version(self, capsys, ctx):
+        """The the early exit branch without any output."""
+        console.show_version(ctx, _param='discarded', value=False)
+
+        captured = capsys.readouterr()
+
+        assert captured.out == ''
+
+    def test_final_version(self, capsys, ctx, monkeypatch):
+        """For final versions, NO "development" warning is emitted."""
+        version = '1.2.3'
+        monkeypatch.setattr(console.urban_meal_delivery, '__version__', version)
+
+        with pytest.raises(click.exceptions.Exit):
+            console.show_version(ctx, _param='discarded', value=True)
+
+        captured = capsys.readouterr()
+
+        assert captured.out.endswith(f', version {version}\n')
+
+    def test_develop_version(self, capsys, ctx, monkeypatch):
+        """For develop versions, a warning thereof is emitted."""
+        version = '1.2.3.dev0'
+        monkeypatch.setattr(console.urban_meal_delivery, '__version__', version)
+
+        with pytest.raises(click.exceptions.Exit):
+            console.show_version(ctx, _param='discarded', value=True)
+
+        captured = capsys.readouterr()
+
+        assert captured.out.strip().endswith(f', version {version} (development)')
+
+
+class TestCLI:
+    """Test the `umd` CLI utility.
+
+    The test cases are integration tests.
+    Therefore, they are not considered for coverage reporting.
+    """
+
+    # pylint:disable=no-self-use
+
+    @pytest.fixture
+    def cli(self) -> click_testing.CliRunner:
+        """Initialize Click's CLI Test Runner."""
+        return click_testing.CliRunner()
+
+    @pytest.mark.no_cover
+    def test_no_options(self, cli):
+        """Exit with 0 status code and no output if run without options."""
+        result = cli.invoke(console.main)
+
+        assert result.exit_code == 0
+        assert result.output == ''
+
+    # The following test cases validate the --version / -V option.
+
+    version_options = ('--version', '-V')
+
+    @pytest.mark.no_cover
+    @pytest.mark.parametrize('option', version_options)
+    def test_final_version(self, cli, monkeypatch, option):
+        """For final versions, NO "development" warning is emitted."""
+        version = '1.2.3'
+        monkeypatch.setattr(console.urban_meal_delivery, '__version__', version)
+
+        result = cli.invoke(console.main, option)
+
+        assert result.exit_code == 0
+        assert result.output.strip().endswith(f', version {version}')
+
+    @pytest.mark.no_cover
+    @pytest.mark.parametrize('option', version_options)
+    def test_develop_version(self, cli, monkeypatch, option):
+        """For develop versions, a warning thereof is emitted."""
+        version = '1.2.3.dev0'
+        monkeypatch.setattr(console.urban_meal_delivery, '__version__', version)
+
+        result = cli.invoke(console.main, option)
+
+        assert result.exit_code == 0
+        assert result.output.strip().endswith(f', version {version} (development)')
diff --git a/tests/test_version.py b/tests/test_version.py
new file mode 100644
index 0000000..474b7b1
--- /dev/null
+++ b/tests/test_version.py
@@ -0,0 +1,114 @@
+"""Test the package's version identifier.
+
+This packaged version identifier must adhere to PEP440
+and a strict subset of semantic versioning:
+
+- version identifiers must follow the x.y.z format
+  where x.y.z are non-negative integers
+- non-final versions are only allowed with a .devN suffix
+  where N is also a non-negative integer
+"""
+
+import re
+
+import pytest
+from packaging import version as pkg_version
+
+import urban_meal_delivery
+
+
+class TestPEP404Compliance:
+    """Packaged version identifier is PEP440 compliant."""
+
+    # pylint:disable=no-self-use
+
+    @pytest.fixture
+    def parsed_version(self) -> str:
+        """The packaged version."""
+        return pkg_version.Version(urban_meal_delivery.__version__)  # noqa:WPS609
+
+    def test_parsed_version_has_no_epoch(self, parsed_version):
+        """PEP440 compliant subset of semantic versioning: no epoch."""
+        assert parsed_version.epoch == 0
+
+    def test_parsed_version_is_non_local(self, parsed_version):
+        """PEP440 compliant subset of semantic versioning: no local version."""
+        assert parsed_version.local is None
+
+    def test_parsed_version_is_no_post_release(self, parsed_version):
+        """PEP440 compliant subset of semantic versioning: no post releases."""
+        assert parsed_version.is_postrelease is False
+
+    def test_parsed_version_is_all_public(self, parsed_version):
+        """PEP440 compliant subset of semantic versioning: all public parts."""
+        assert parsed_version.public == urban_meal_delivery.__version__  # noqa:WPS609
+
+
+class TestSemanticVersioning:
+    """Packaged version follows a strict subset of semantic versioning."""
+
+    # pylint:disable=no-self-use
+
+    version_pattern = re.compile(
+        r'^(0|([1-9]\d*))\.(0|([1-9]\d*))\.(0|([1-9]\d*))(\.dev(0|([1-9]\d*)))?$',
+    )
+
+    def test_version_is_semantic(self):
+        """Packaged version follows semantic versioning."""
+        result = self.version_pattern.fullmatch(
+            urban_meal_delivery.__version__,  # noqa:WPS609
+        )
+
+        assert result is not None
+
+    # The next two test cases are sanity checks to validate the version_pattern.
+
+    @pytest.mark.parametrize(
+        'version',
+        [
+            '0.1.0',
+            '1.0.0',
+            '1.2.3',
+            '1.23.456',
+            '123.4.56',
+            '10.11.12',
+            '1.2.3.dev0',
+            '1.2.3.dev1',
+            '1.2.3.dev10',
+        ],
+    )
+    def test_valid_semantic_versioning(self, version):
+        """Versions follow the x.y.z or x.y.z.devN format."""
+        result = self.version_pattern.fullmatch(version)
+
+        assert result is not None
+
+    @pytest.mark.parametrize(
+        'version',
+        [
+            '1',
+            '1.2',
+            '-1.2.3',
+            '01.2.3',
+            '1.02.3',
+            '1.2.03',
+            '1.2.3.4',
+            '1.2.3.abc',
+            '1.2.3-dev0',
+            '1.2.3+dev0',
+            '1.2.3.d0',
+            '1.2.3.develop0',
+            '1.2.3.dev-1',
+            '1.2.3.dev01',
+            '1.2.3..dev0',
+            '1-2-3',
+            '1,2,3',
+            '1..2.3',
+            '1.2..3',
+        ],
+    )
+    def test_invalid_semantic_versioning(self, version):
+        """Versions follow the x.y.z or x.y.z.devN format."""
+        result = self.version_pattern.fullmatch(version)
+
+        assert result is None