Create pull_request_template.md (ricky0123#74)

.github/pull_request_template.md

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+## Description of changes
+
+<!--
+Please describe your changes and link to related issues.
+-->
+
+## Checklist
+
+<!--
+Please do all of the following that apply to your PR.
+If you are submitting an update to the source code of vad-web or vad-react,
+all items will likely be relevant. You are welcome to create your PR as a draft
+PR without having completed all items.
+-->
+
+- [ ] Added a test to verify that changes work as expected (if one doesn't exist already) <!-- can be an automated test or an update to the manual test site -->
+- [ ] Ran automated tests successfully <!-- `npm run build && npm run test` -->
+- [ ] Viewed manual test site and verified that pages are working <!-- `npm run dev` -->
+- [ ] Bumped versions in relevant packages
+- [ ] Updated relevant changelogs <!-- see the `/changelogs` directory -->