Add PR template

.github/pull_request_template.md

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+<!--
+Thanks for creating a pull request!
+
+If this is your first time, please make sure to review CONTRIBUTING.MD.
+
+Please copy the appropriate `:text:` or icon to the beginning of your PR title:
+
+:sparkles: ✨ feature
+:bug: 🐛 bug fix
+:book: 📖 docs
+:memo: 📝 proposal
+:warning: ⚠️ breaking change
+:seedling: 🌱 other/misc
+:question: ❓ requires manual review/categorization
+
+-->
+## Summary
+
+## Related issue(s)
+
+Fixes #
+
+## Release Notes
+
+<!--
+Please add a release note in the block below. Leave NONE only if no user-facing changes are in this PR.
+-->
+
+```release-note
+NONE
+```