add style guide for gemini

[abdullah-cognite]

Style guide: https://developers.google.com/gemini-code-assist/docs/customize-gemini-behavior-github#styleguide.md

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.63%. Comparing base (74fb523) to head (9523b7f).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #327      +/-   ##
==========================================
+ Coverage   75.48%   75.63%   +0.14%     
==========================================
  Files          38       38              
  Lines        4083     4083              
  Branches      487      487              
==========================================
+ Hits         3082     3088       +6     
+ Misses        817      812       -5     
+ Partials      184      183       -1     

see 2 files with indirect coverage changes

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