adds PR template (#55)

.github/pull_request_template.md

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+#### :book: Summary
+
+<!-- Provide a summary of your changes. Describe the why and not how. -->
+
+#### :bookmark_tabs: Test Plan
+
+> :bulb: Select your test plan for the code changes.
+
+- [ ] Tested via Drone.io pipeline
+- [ ] Custom test
+- [ ] No test plan
+
+##### Details / Justification
+
+<!-- Add your test details or justification for missing tests here. -->
+
+#### :books: Additional Notes
+
+<!-- A place for additional detail notes. -->