[#405] Created PR markdown template

.github/PULL_REQUEST_TEMPLATE/pull_request_template.md

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+### All Submissions:
+
+* [ ] Have you followed the guidelines in our Contributing document?
+* [ ] Have you checked to ensure there aren't other open [Pull Requests](nasa/nos3/pulls) for the same update/change?
+
+<!-- You can erase any parts of this template not applicable to your Pull Request. -->
+
+### New Feature Submissions:
+
+1. [ ] Does your submission pass tests?
+2. [ ] Have you lint your code locally prior to submission?
+
+### 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?