Create pull_request_template.md

.github/pull_request_template.md

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+## Description
+<!-- Please describe what you've added (bullet points are good!), and link to the issue that this Pull Request addresses, e.g. type "#5" if you're addressing issue number 5 and it will automatically create a link -->
+
+## Checklist (contributor)
+<!-- Contributors: please complete as much of this checklist as you can when you create this Pull Request.
+Mark this Pull Request as Ready for Review when you're happy with all the changes you've made.
+-->
+
+- [ ] Marked as draft
+- [ ] Linked to issue
+- [ ] Filled in description
+- [ ] Gave this Pull Request a descriptive title
+
+## Checklist (maintainer)
+<!-- Maintainers: please check the following before you merge-->
+- [ ] Built site locally.
+- [ ] Changes are as discussed in issue.
+- [ ] New pages are linked in the TOC/navigation?
+- [ ] Have we added the contributor to our all-contributors?
+- [ ] One sentence per line