Create PULL_REQUEST_TEMPLATE.md

.github/PULL_REQUEST_TEMPLATE.md

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+## Summary
+
+This PR can be summarized in the following changelog entry:
+
+*
+
+## Relevant technical choices:
+
+*
+
+## Test instructions
+
+This PR can be tested by following these steps:
+
+*
+
+## Quality assurance
+
+* [ ] I have tested this code to the best of my abilities
+* [ ] I have added unittests to verify the code works as intended
+
+Fixes #