Add code review checklist for PRs (PR #12037)

Co-authored-by: Leonard de Ruijter <[email protected]>

.github/PULL_REQUEST_TEMPLATE.md

@@ -9,11 +9,24 @@ Please also note that the NVDA project has a Citizen and Contributor Code of Con
 
 ### Description of how this pull request fixes the issue:
 
-### Testing performed:
+### Testing strategy:
 
 ### Known issues with pull request:
 
 ### Change log entry:
 
 Section: New features, Changes, Bug fixes
 
+### Code Review Checklist:
+
+This checklist is a reminder of things commonly forgotten in a new PR.
+Please do a self-review to check these items.
+Reviewers will not approve the PR until these are met.
+
+- [ ] Pull Request description is up to date.
+- [ ] Unit tests.
+- [ ] System (end to end) tests.
+- [ ] Manual tests.
+- [ ] User Documentation.
+- [ ] Change log entry.
+- [ ] Context sensitive help for GUI changes.