LLM Policy Update in Contribution Guideline

[al3xa23]

• Declare LLM use
• How to deal with people using AI without understanding? => reject, requirement to understand the code
• Ignore copyright, follow-up
• How to integrate in review?
• Do not enforce attribution, just disclaimer "VILLASnode uses LLM...", eventually add in PR comments
• Disclose AI use in PR
• README includes that all code before year xy has no AI generated code to the best of our knowledge
• Agents.md?

[stv0g]

The VILLAS contribution guidelines are in the documentation repo.