[Docs]: Create initial documentation

[AkalUstat]

Creates documentation for:

• introduction to the codebase + contributing docs
• creates documentation for code that will not change in the near future (root src, components, parts of store, and screens)

[AkalUstat]

On hold until #97 #98 #99 are done

[AkalUstat]

this is too out of date, redo at a later time