C# Intellisensev documentation support

[KinNeko-De]

• add documentation file which will be inlcuded in the nuger package

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 62.29%. Comparing base (37bcb3a) to head (46aebf6).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #15   +/-   ##
=======================================
  Coverage   62.29%   62.29%           
=======================================
  Files           5        5           
  Lines          61       61           
  Branches        8        8           
=======================================
  Hits           38       38           
  Misses         23       23           

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