Add Pull Request Template
Add Pull Request Template

Reason for Change
=================
* Standardize PR communication
* Add a level of detail to the change requests

Changes
=======
* Add a template file to the magic `/.github` directory
* See [documentation](https://docs.github.com/en/communities/using-templates-to-encourage-useful-issues-and-pull-requests/creating-a-pull-request-template-for-your-repository)

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