✨ Add pull request template

.github/PULL_REQUEST_TEMPLATE.md

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+## Description
+
+<!--
+Write a description of your pull request.
+-->
+
+## Related Tickets & Documents
+
+<!--
+For pull requests that relate or close an issue, please include them
+below.  We like to follow [Github's guidance on linking issues to pull requests](https://docs.github.com/en/issues/tracking-your-work-with-issues/linking-a-pull-request-to-an-issue).
+
+For example having the text: "closes #1234" would connect the current pull
+request to issue 1234.  And when we merge the pull request, Github will
+automatically close the issue.
+-->
+
+- Related Issue #
+- Closes #
+
+- [ ] I clicked on "Allow edits from maintainers"