Add pull request template

.github/pull_request_template.md

@@ -0,0 +1,23 @@
+## Summary
+
+> Developers should provide a summary of the proposed changes here and include "closes #<ISSUE NUMBER>" if this addresses an open issue.
+> Developers should include validation test reports demonstrating that the reported errors have been solved.
+
+## Reviewer Checklist
+
+> Reviewers should tick the following boxes before approving and merging the PR.
+
+- [ ] The PR targets the `develop` branch
+- [ ] The PR is assigned to the developer
+- [ ] The PR has appropriate labels
+- [ ] The PR is included in appropriate projects and/or milestones
+- [ ] The PR includes a clear description of the proposed changes
+- [ ] If the PR addresses an open issue the description includes "closes #<ISSUE NUMBER>"
+- [ ] The code and documentation style match the current standards
+- [ ] Documentation has been added/updated consistently with the code
+- [ ] All CI tests are passing
+- [ ] API docs have been built and checked at least once (if relevant)
+- [ ] All changed files have been checked and comments provided to the developer
+- [ ] All of the reviewer's comments have been satisfactorily addressed by the developer
+- [ ] All Validation tests for the reported error are passing
+