docs: add readme.md

[zhiheng123]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 57.98%. Comparing base (d28fa40) to head (e4a1b7f).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main      #24   +/-   ##
=========================================
  Coverage     57.98%   57.98%           
  Complexity       45       45           
=========================================
  Files            33       33           
  Lines           119      119           
=========================================
  Hits             69       69           
  Misses           49       49           
  Partials          1        1           

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