Create PULL_REQUEST_TEMPLATE.md

.github/PULL_REQUEST_TEMPLATE.md

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+<!--
+
+Before making a PR, please read our contributing guidelines https://github.com/operator-framework/operator-lifecycle-manager/blob/master/CONTRIBUTING.MD
+Note: Make sure your branch is rebased to the latest upstream master.
+
+-->
+
+**Description of the change:**
+
+
+**Motivation for the change:**
+
+**Reviewer Checklist**
+- [ ] Implementation matches the proposed design, or proposal is updated to match implementation
+- [ ] Sufficient unit test coverage 
+- [ ] Sufficient end-to-end test coverage
+- [ ] Docs updated or added to `/docs` 
+- [ ] Commit messages sensible and descriptive
+
+
+<!--
+
+Note: If this PR is fixing an issue make sure to add a note saying:
+Closes #<ISSUE_NUMBER>
+
+-->