Create PULL_REQUEST_TEMPLATE.md

.github/PULL_REQUEST_TEMPLATE.md

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+<!--
+Thanks for submitting a pull request! We appreciate you spending the time to work on these changes.
+Please provide enough information so that others can review your pull request. The three fields below are mandatory.
+-->
+
+## Summary
+
+<!--
+Explain the **motivation** for making this change. What existing problem does the pull request solve?
+-->
+
+## Changelog
+
+<!--
+Help reviewers and the release process by writing your own changelog entry. See this project's CHANGELOG.md
+for an example.
+-->
+
+## Test Plan
+
+<!--
+Demonstrate the code is solid. Example: Unit tests, screenshots from an app showing
+the change in the module.
+-->