docs: add code of conduct

[zhiheng123]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.03%. Comparing base (2646900) to head (612f768).

Additional details and impacted files

@@            Coverage Diff            @@
##               main      #23   +/-   ##
=========================================
  Coverage     56.03%   56.03%           
  Complexity       86       86           
=========================================
  Files            21       21           
  Lines           373      373           
  Branches         15       15           
=========================================
  Hits            209      209           
  Misses          149      149           
  Partials         15       15           

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[hezhangjian]

ci fail