API Documentation in README

[nstepien]

Part of #2575

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.67%. Comparing base (601ca88) to head (6c3cc8a).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3904   +/-   ##
=======================================
  Coverage   97.67%   97.67%           
=======================================
  Files          42       42           
  Lines        1289     1292    +3     
  Branches      348      350    +2     
=======================================
+ Hits         1259     1262    +3     
  Misses         30       30           

Files with missing lines	Coverage Δ
src/DataGrid.tsx	98.80% <100.00%> (+<0.01%)	⬆️

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