Create pull_request_template.md

Author: alexrudall

pull_request_template.md

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+## All Submissions:
+
+* [ ] Have you followed the guidelines in our [Contributing document](../../blob/main/CONTRIBUTING.md)?
+* [ ] Have you checked to ensure there aren't other open [Pull Requests](../../pulls) for the same update/change?
+* [ ] Do the tests pass? (`rake spec`)
+* [ ] Does Rubocop pass? (`rubocop`)
+* [ ] Have you added an explanation of what your changes do and why you'd like us to include them?