Update the pr template

Author: commjoen

PULL_REQUEST_TEMPLATE.md

@@ -34,6 +34,7 @@ Optionally, provide any helpful references that may help the reviewer(s).
 ### Checklist:
 
 -   [ ] All the contributions made are solely the work of me and my co-authors
+-   [ ] I used AI to generate parts of the content.
 -   [ ] I tested the changes in this PR (if applicable)
 -   [ ] I added unit tests to ensure my change works (when change in Java or on front-end code)
 -   [ ] I added UI tests to ensure my UI changes work (when change in the overall UI, not needed if just adding a challenge)