Create pull_request_template.md

Author: chandr-andr

.github/pull_request_template.md

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+### New Feature Submissions:
+
+1. [ ] Does your submission pass tests?
+2. [ ] Have you lint your code locally prior to submission?
+3. [ ] Have you added all necessary documentation in Rust/Python stub code?
+
+### Changes to Core Features:
+
+* [ ] Have you added an explanation of what your changes do and why you'd like us to include them?
+* [ ] Have you written new tests for your core changes, as applicable?
+* [ ] Have you successfully ran tests with your changes locally?