implement draft documentation

(likely by mkdocs)

• example docs structure

docs/
|- introduction.md
|- installation.md
|- configuration.md
|- tutorial.md
|- manual.md
|- api.md
|- index.md
|- develop.md

• folder with examples that are documentated
• docstrings on "api" facing functions and classes
• all compile into html
• make a page about model assumptions - things like the internal model used for the exp_conf time slice and how one could create different internal models and implement functions to compute snrs based on that instead
• add a list of definitions and terms (things like two way range and one way range)

that is all that is needed!

example usage of mkdocs https://github.com/danielk333/pyant