adds contribution docs for helm charts

[ChrisJBurns]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 40.77%. Comparing base (cf5e7ea) to head (4d85de8).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1776      +/-   ##
==========================================
+ Coverage   40.75%   40.77%   +0.02%     
==========================================
  Files         184      184              
  Lines       21420    21420              
==========================================
+ Hits         8730     8735       +5     
+ Misses      12024    12021       -3     
+ Partials      666      664       -2     

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[coveralls]

coverage: 38.526% (+0.01%) from 38.516%
when pulling 4d85de8 on helm-chart-contributing
into cf5e7ea on main.