developer documentation (API) is missing

[fdiblen]

developer documentation (API) is missing

[fdiblen]

1. we need to add docstrings:
   examples:

• http://sphinxcontrib-napoleon.readthedocs.io/en/latest/example_google.html
• https://stackoverflow.com/questions/3898572/what-is-the-standard-python-docstring-format

2. use one of the automated tools:

• http://www.sphinx-doc.org/en/stable/
• https://docs.python.org/3/library/pydoc.html
• https://github.com/pycco-docs/pycco

[fdiblen]

Solved with #40. Closing.