README: C/C++, ObjC, Swift

[xushiwei]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.23%. Comparing base (cba93e6) to head (961ad6e).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #970   +/-   ##
=======================================
  Coverage   89.23%   89.23%           
=======================================
  Files          45       45           
  Lines        8617     8617           
=======================================
  Hits         7689     7689           
  Misses        763      763           
  Partials      165      165           

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