Add community guidelines section in readme

[tmigot]

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[codecov]

Codecov Report

Base: 90.90% // Head: 90.90% // No change to project coverage 👍

Coverage data is based on head (e2a85d7) compared to base (f79b6b5).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #100   +/-   ##
=======================================
  Coverage   90.90%   90.90%           
=======================================
  Files           2        2           
  Lines         154      154           
=======================================
  Hits          140      140           
  Misses         14       14           

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