Add warning about GenAI code generation

[mhucka]

As we are certain to get more and more submissions generated with the help of GenAI/LLM tools, we need to tell users about the policy regarding code created by AI tools.

Note: use the view file feature in the GitHub interface to view the formatted version of the file, in order to see the way that GitHub renders the warning.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.17%. Comparing base (7a834a0) to head (f3d55db).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7098   +/-   ##
=======================================
  Coverage   98.17%   98.17%           
=======================================
  Files        1089     1089           
  Lines       95177    95177           
=======================================
+ Hits        93438    93439    +1     
+ Misses       1739     1738    -1     

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