Add ADOPTERS.md

[jotak]

WIP: ask around who we could add there...

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.53%. Comparing base (d7c6db8) to head (51a23df).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2496      +/-   ##
==========================================
- Coverage   72.63%   72.53%   -0.10%     
==========================================
  Files         104      104              
  Lines       10615    10615              
==========================================
- Hits         7710     7700      -10     
- Misses       2430     2442      +12     
+ Partials      475      473       -2     

Flag	Coverage Δ
unittests	72.53% <ø> (-0.10%)	⬇️

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see 7 files with indirect coverage changes

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