Create pull_request_template.md

pull_request_template.md

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+# Intent:
+
+- [ ] Explain here what the goal is, so reviewer can read the implementation and judge whether that goal is achieved.
+
+# Validation:
+
+- [ ] Are changes covered by tests so we know existing functionality is not broken?
+- [ ] Is the new functionality covered by tests?
+- [ ] For functionality that is impractical to test
+  - [ ] is there a demo?
+  - [ ] does it look like you'd expect?
+
+# State of PR
+- [ ] Ready to merge on master
+- [ ] CI passes
+- [ ] Code is documented via rustdoc commments for readers post-landing
+- [ ] Changes that need explanation pre-landing (why make the change) have self-review comments