[github] Link AI coding policy from CONTRIBUTING.md

Change-Id: I2b209b10c55b412dc77f1c1ecd92bffaa73733b9
Reviewed-on: https://chrome-internal-review.googlesource.com/c/v8/fuzzilli/+/9659015
Auto-Submit: Matthias Liedtke <mliedtke@google.com>
Reviewed-by: Leon Bettscheider <bettscheider@chromium.org>
Commit-Queue: Matthias Liedtke <mliedtke@google.com>

Author: Liedtke

CONTRIBUTING.md

@@ -22,7 +22,9 @@ use GitHub pull requests for this purpose. Consult
 [GitHub Help](https://help.github.com/articles/about-pull-requests/) for more
 information on using pull requests.
 
-## Community Guidelines
+## Community Guidelines & AI Coding Policy
 
 This project follows [Google's Open Source Community
 Guidelines](https://opensource.google.com/conduct/).
+
+It also follows the [Chromium AI Coding Policy](https://chromium.googlesource.com/chromium/src/+/main/agents/ai_policy.md).