docs: add code of conduct

[zhiheng123]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 52.73%. Comparing base (8c82c14) to head (39038f5).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main      #41   +/-   ##
=========================================
  Coverage     52.73%   52.73%           
  Complexity       94       94           
=========================================
  Files            21       21           
  Lines           603      603           
  Branches         56       56           
=========================================
  Hits            318      318           
  Misses          237      237           
  Partials         48       48           

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