[Feature]: Add evaluation criteria for code quality and documentation

[ll7]

Description

As mentioned in the initial presentation of PAF23, the documentation of your development has an Influence on your final grade.
In an effort to set some kind of expectation, we will create a document with general expectations towards your documentation.

These requirements are initentionally designed as a PR, such that you can suggest changes and modifications.

Definition of Done

• One markdown file spcifying the documentation requirements.