Add AI Policy

docs/contributing.rst

@@ -100,6 +100,19 @@ Improvements of the Instaloader source or its documentation can be proposed as a
   agrees that the change might be an improvement, or if you want to discuss
   your basic proposal, before working on a pull request.
 
+AI Policy
+---------
+
+- If generative AI was used to create notable portions of a contribution, the
+  author must disclose which parts were AI-assisted (e.g. research, testing,
+  coding, or documentation).
+
+- The author must carefully review and understand the contribution before
+  submitting it.
+
+- If the maintainers need more effort to review the contribution than it took
+  to create it, please do not submit it.
+
 Proposing Features
 ------------------