Add .github/PULL_REQUEST_TEMPLATE.md

Author: enaccess-terraform-authentication[bot]

.github/PULL_REQUEST_TEMPLATE.md

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+<!-- First of all, thank you for your contribution to this repository! -->
+
+<!-- Please give the Pull Request a meaningful title for the release notes -->
+
+### Brief summary of the change made
+
+<!-- Please include `closes: #XXXX` to automatically close any corresponding issue when the pull request is merged. Alternatively if not fully closed you can say `makes progress on: #XXXX`.-->
+
+### Are there any other side effects of this change that we should be aware of?
+
+### Describe how you tested your changes?
+
+<!-- For manual testing-please provide detailed steps, screenshots, etc.. -->
+<!-- If the repository provides unit tests, please add test cases covering the changes. -->
+
+### Pull Request checklist
+
+Please confirm you have completed any of the necessary steps below.
+
+- [ ] Meaningful Pull Request title and description
+- [ ] Changes tested as described above
+- [ ] Added appropriate documentation for the change.
+- [ ] Created GitHub issues for any relevant followup/future enhancements if appropriate.