Add decision record for analysis and design documentation

[t2gran]

Summary

This adds a guideline for analysis and design. It include a sheet cheat for drawing UML domain models.

Issue

🟥 No issue

Unit tests

🟥 Doc only

Documentation

✅ This is developer doc

Changelog

🟥 Not relevant

Bumping the serialization version id

🟥 Not needed

[leonardehrenfried]

Which software did you use for the diagram? Maybe it's worth recommending something.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.76%. Comparing base (bc3147f) to head (90068af).
Report is 71 commits behind head on dev-2.x.

Additional details and impacted files

@@            Coverage Diff             @@
##             dev-2.x    #6281   +/-   ##
==========================================
  Coverage      69.76%   69.76%           
+ Complexity     17752    17751    -1     
==========================================
  Files           2010     2010           
  Lines          75948    75948           
  Branches        7784     7784           
==========================================
  Hits           52984    52984           
  Misses         20257    20257           
  Partials        2707     2707           

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[t2gran]

Which software did you use for the diagram? Maybe it's worth recommending something.

I used draw.io - I will add a recommendation.