chore: add AI contribution policy to CONTRIBUTING.md (#1835)

Author: ianbotsf

CONTRIBUTING.md

@@ -69,6 +69,21 @@ To send us a pull request, please:
 GitHub provides additional document on [forking a repository](https://help.github.com/articles/fork-a-repo/) and 
 [creating a pull request](https://help.github.com/articles/creating-a-pull-request/).
 
+### 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 the
+  [Amazon Open Source Code of Conduct](https://aws.github.io/code-of-conduct).
+
 ### API and style guidelines
 
 The AWS SDK for Kotlin is a multiplatform library intended to work for a wide variety of environments and use cases.