Feature/math

[ken-morel]

Hello, this is a sum of changes and improvements regarding documentation and usage.

Thanks!

[ken-morel]

Hello, like your library, it provide many base core functionalities for displaying maths, but I will outline some issues:

• It may lack of proper documentation: Learning how to use it required me to read it's source, which many users may not afford to.
• It may be hard to use: Sometimes it will be hard and timetaking to create and assemble such primitives one by one from code

This brings in more documentation using docstrings and handsdown generated markdown documentation and also adds a helper module math which provide simpler interface to the packages core