Add PR checklist template

.github/.github/pull_request_template.md

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+<!-- Please describe your pull request here. -->
+
+### Testing done
+
+<!-- Comment:
+Provide a clear description of how this change was tested.
+At minimum this should include proof that a computer has executed the changed lines.
+Ideally this should include an automated test or an explanation as to why this change has no tests.
+Note that automated test coverage is less than complete, so a successful PR build does not necessarily imply that a computer has executed the changed lines.
+If automated test coverage does not exist for the lines you are changing, you must describe the scenario(s) in which you manually tested the change.
+For frontend changes, include screenshots of the relevant page(s) before and after the change.
+For refactoring and code cleanup changes, exercise the code before and after the change and verify the behavior remains the same.
+-->
+
+### Submitter checklist
+- [ ] Make sure you are opening from a **topic/feature/bugfix branch** (right side) and not your main branch!
+- [ ] Ensure that the pull request title represents the desired changelog entry
+- [ ] Please describe what you did
+- [ ] Link to relevant issues in GitHub or Jira
+- [ ] Link to relevant pull requests, esp. upstream and downstream changes
+- [ ] Ensure you have provided tests - that demonstrates feature works or fixes the issue
+
+<!--
+Put an `x` into the [ ] to show you have filled the information.
+The template comes from https://github.com/jenkinsci/.github/blob/master/.github/pull_request_template.md 
+You can override it by creating .github/pull_request_template.md in your own repository 
+-->