chore: Add PR template

.github/pull_request_template.md

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+<!--
+Delete all lines in this comment except the type of issue being addressed.
+**Type:  Bug**
+**Type:  Documentation**
+**Type:  Feature**
+**Type:  Refactor**
+**Type:  Task**
+-->
+
+## Description
+<!--
+Insert a brief description of the changes in this PR.
+-->
+
+## Related Issues/PRs
+<!--
+Mention any issues or pull requests that this PR is related to.  E.g.,
+* Closes #456.
+* Related to #123.
+* Etc.
+-->
+
+## Motivation
+<!--
+If this wasn't covered in any related issues linked above, why was this change
+needed?  What does it do for us?
+-->
+
+## Implementation Details
+<!--
+If appropriate, why did you implement things the way you did?  What
+alternatives did you consider?  Are there any gotchas to be aware of?  How does
+this set us up to be in a better place in the future?  Etc.
+-->
+
+## Screenshots/Recordings
+<!--
+If applicable, visually demonstrate the behavior before and after your changes.
+-->
+
+
+## Testing
+<!--
+Indicate what testing you added to cover your changes, and what testing you ran
+to ensure your changes are working as expected.
+-->
+
+
+## Documentation
+<!--
+Indicate how and where you've updated the documentation to cover your changes.
+-->