Adds contributing.md

[somethings (lasomethingsomething)]

Self-explanatory. Sets boundaries to guide contributions with more prior discussion to avoid frustrating contributors and wasting effort.

[Codecov Comments Bot (codecov-commenter)]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 47.33%. Comparing base (9d6d20b) to head (1938673).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1158   +/-   ##
=======================================
  Coverage   47.33%   47.33%           
=======================================
  Files         230      230           
  Lines       16501    16501           
=======================================
  Hits         7810     7810           
  Misses       8691     8691           

Flag	Coverage Δ
go-test	47.33% <ø> (ø)

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