Create gh-pages with documentation

[pwittchen]

Things to do:

• generate documentation automatically with docsify basing on README.md file (have a look at this as a reference: https://github.com/pwittchen/ReactiveNetwork#documentation)
• add script / Makefile task for generating/updating the documentation (have a look at this script as a reference: https://github.com/pwittchen/ReactiveNetwork/blob/RxJava2.x/update_docs.sh)

Consider using alternative tools suited for Python - e.g.:

• https://realpython.com/generating-code-documentation-with-pycco/
• https://github.com/mitmproxy/pdoc
• https://www.mkdocs.org/
• http://www.sphinx-doc.org

[pwittchen]

Done.