Create documentation by adding docstrings

[JaroslawHryszko]

This task is about going thru the entire Frege source code and describing it by adding docstrings in all required places.

Then, these docstrings can be parsed by Sphinx and automatically transformed into separate, hypertext-based documentation.

[Natheesh-N]

I'll take this

[sudheesanamp2003]

i will take it

[JaroslawHryszko]

@sudheesanamp2003 @Natheesh-N do you have enough skills to understand this project's source code and properly describe it by docstrings? :) What are your plans / proposed approach to work on this issue?