[Docs] Add AI-generated content policy to Contribution Guide

[q404365631]

Summary

Adds an AI-Generated Content Policy section to CONTRIBUTING.md, as requested in #146.

Changes

• Added ## AI-Generated Content Policy section before ## Pull Request Guidelines
• Covers: disclosure requirement, review before submitting, no bulk AI submissions, originality, and accountability

Closes #146

[vercel]

Someone is attempting to deploy a commit to the osama's projects Team on Vercel.

A member of the Team first needs to authorize it.

[github-actions]

Thank you for the pull request! ✅

A maintainer will review this soon. Please be patient while we take a look. 🙌

[O2sa]

Change the author email of the commit to make the commit author refer to your github account.

To fix the author email for this specific commit, you can run these commands locally:

Update your config: git config user.email "your-email@example.com"

Amend the commit: git commit --amend --reset-author --no-edit

Force push the update: git push origin YOUR_BRANCH_NAME --force

[github-actions]

🎊 Welcome, @q404365631! Your first contribution has been merged! 🚀

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