New abstraction level guide

[dgedon]

Solves issue #1757 for new abstraction levels. Possibly at times it is too detailed and could be simplified.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.31%. Comparing base (28f3deb) to head (7a07a07).
⚠️ Report is 40 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1758      +/-   ##
==========================================
- Coverage   87.89%   83.31%   -4.58%     
==========================================
  Files         134      137       +3     
  Lines       11168    11526     +358     
==========================================
- Hits         9816     9603     -213     
- Misses       1352     1923     +571     

Flag	Coverage Δ
fast	83.31% <ø> (?)
unittests	?

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