chore: add additional text to CONTRIBUTING.rst (boto#3662)

Author: kellertk

CONTRIBUTING.rst

@@ -93,3 +93,22 @@ and provide a list of any failing checks. After these are addressed,
 you can commit the changes prior to publishing the PR.
 These checks are also included in our CI setup under the "Lint" workflow which
 will provide output on Github for anything missed locally.
+
+Automated Tools
+---------------
+The use of AI tooling for assisted development work is accepted and encouraged
+in this repository, but due to the volume of submissions we ask that you observe
+the following rules:
+
+- All issue and pull request submissions to this repository that are sourced by
+  AI must first be reviewed by a human before submitting to the repository.
+  Items reviewed in this way must include a statement like "generated by AI
+  tools, and reviewed by <person>"
+- Please ensure that your submissions are actually improvements. While we are
+  grateful for any proposed fixes, even if they are very small, behavior that
+  looks like creating nuisance PRs or artificially inflating submission counts
+  is not acceptable.
+- We may close issues or pull requests, or limit your ability to interact with
+  this repository, for behavior that in our estimation violates these rules or
+  any of the other rules in this repository's
+  `Code of Conduct <CODE_OF_CONDUCT.md>`.