Create PULL_REQUEST_TEMPLATE.md

.github/workflows/PULL_REQUEST_TEMPLATE.md

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+#### Context
+What is the purpose of this PR? Is it to
+- [ ] add a new feature
+- [ ] fix a bug
+- [ ] update tests and/or documentation
+- [ ] other (please add here)
+
+Please link to any issues this PR addresses.
+
+#### Changelog
+What are the changes made in this PR?
+
+#### Test plan
+Please make sure to do each of the following if applicable to your PR. (If you're not sure about any one of these just ask and we will happily help.)
+
+- [ ] run pre-commit hooks and linters (make sure you've first installed via `pre-commit install`)
+- [ ] add unit tests for any new functionality
+- [ ] update docstrings for any new or updated methods or classes
+- [ ] run unit tests via `pytest tests`
+- [ ] include relevant commands and any other artifacts in this summary (eval results, etc.)