Suggestions for contribution

[Ruberhauptmann]

I just discovered this package and used it to generate some graphics for my masters thesis (graphene, but with the basis rotated in comparison to the predefined one to be in line with my definition) . It absolutely saved me a lot of work doing things myself, but I struggled a bit with the documentation, so I would like to contribute to that a bit.

I can imagine adding the following:

• My code as an example somewhere, to illustrate how to create lattice and BZ graphics
• API Documentation where its missing
• Typehints

Also, I couldn't really figure out how to use the things provided in lattpy.disptools, so I did plotting of bands myself. If you have any hints, I can also add that to the documentation.