[MichaelClerx]

Added LLM policy to contributing.md, near part that describes the process that should be followed (make issue, discuss, only then do the work)

Borrowed heavily from @martinjrobins diffsol contributing guidelines.

[MichaelClerx]

@pints-team/devs are we OK with this?

1. AI code is OK, as long as you review it and understand what you are doing
2. Posting mini essays by AI is not
3. Reminder that the way to contribute something new is not to write and dump, but to start with an issue and discuss

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (6e56b06) to head (58fb61a).

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #1749   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           97        97           
  Lines         9762      9762           
=========================================
  Hits          9762      9762           

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