Add pull request template (#32)

.github/pull_request_template.md

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+<!--
+Thanks for contributing to GraphRAG!
+
+Please do not make *Draft* pull requests, as they still notify anyone watching the repo.
+
+Create a pull request when it is ready for review and feedback.
+
+About this template
+
+The following template aims to help contributors write a good description for their pull requests.
+We'd like you to provide a description of the changes in your pull request (i.e. bugs fixed or features added), the motivation behind the changes, and complete the checklist below before opening a pull request.
+
+Feel free to discard it if you need to (e.g. when you just fix a typo). -->
+
+## Description
+
+[Provide a brief description of the changes made in this pull request.]
+
+## Related Issues
+
+[Reference any related issues or tasks that this pull request addresses.]
+
+## Proposed Changes
+
+[List the specific changes made in this pull request.]
+
+## Checklist
+
+- [ ] I ran the linter and fixed any issues.
+- [ ] I have tested these changes locally.
+- [ ] I have reviewed the code changes.
+- [ ] I have updated the documentation (if necessary).
+- [ ] I have added appropriate unit tests (if applicable).
+- [ ] I have assigned the pull request to the appropriate reviewer(s).
+- [ ] I have updated the CHANGELOG file (if necessary).
+
+## Additional Notes
+
+[Add any additional notes or context that may be helpful for the reviewer(s).]