update project documentation

[goatshriek]

Add and update documentation for parts of the project structure and governance.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 90.79%. Comparing base (ed85c54) to head (a4caa06).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## latest #425 +/- ## ======================================= Coverage 90.79% 90.79% ======================================= Files 48 48 Lines 4335 4335 Branches 577 577 ======================================= Hits 3936 3936 Misses 268 268 Partials 131 131 ```

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[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud