Add CodeQL badge to README

[nietras]

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.25%. Comparing base (c2f1e99) to head (d688d8d).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #126      +/-   ##
==========================================
- Coverage   99.28%   99.25%   -0.03%     
==========================================
  Files          46       46              
  Lines        3343     3347       +4     
  Branches      355      356       +1     
==========================================
+ Hits         3319     3322       +3     
- Misses         21       22       +1     
  Partials        3        3              

Flag	Coverage Δ
Debug	98.62% <ø> (-0.06%)	⬇️
Release	99.14% <ø> (+<0.01%)	⬆️
macos-latest	98.89% <ø> (+3.50%)	⬆️
ubuntu-latest	98.89% <ø> (+<0.01%)	⬆️
windows-latest	98.89% <ø> (+<0.01%)	⬆️

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