Merge pull request #771 from nuttyartist/add-contributing-policy

docs: Add contributing guidelines and AI policy

Author: nuttyartist

CONTRIBUTING.md

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+# Contributing guidelines
+
+* Be respectful.
+* Test your code thoroughly before submitting a pull request.
+* If changes were made to the UI, add 'before' and 'after' screenshots.
+
+## AI Policy
+
+* AI tools may be used to assist in writing code, but the final code must be reviewed and approved by a human before being submitted as a pull request. It is crucial that you understand what you are changing.
+* PR titles *MUST* be written manually by humans.
+* PR descriptions, issues, and comments may be assisted by AI tools, but they *MUST* be reviewed by a human before submission.