Initial commit

- add the following files:
  + LICENSE.txt => use MIT license as the project should be
                   accessible to anybody who wants to learn Python
  + README.md => provide a rough description of the project
  + pyproject.toml => initialize poetry and the add project metadata
  + poetry.lock => initialize poetry
  + .gitignore => hide pyenv and poetry artifacts
  + static/link/ => folder holding images for links
- for the pre-2020 version of the files, check out the "v0.0.0" tag

static/link/README.md

@@ -0,0 +1,2 @@
+This folder contains small images
+that are used to enhance the links in the notebooks and markdown files.