Create pull_request_template.md

.github/pull_request_template.md

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+### Description
+
+<!-- Please include a summary of the change and which issue is fixed. -->
+<!-- Please also include relevant motivation and context. -->
+
+#### Which issue(s) this PR fixes:
+<!-- Usage: `Fixes #<issue number>`, or `Fixes (paste link of issue)`. -->
+Fixes #
+
+### Checklist
+
+- [ ] I have explained the need for this PR and the problem it solves
+- [ ] I have explained the changes or the new features added to this PR
+- [ ] I have added tests corresponding to this change
+- [ ] I have updated the documentation to reflect this change
+- [ ] I have verified that this change is backward compatible
+
+<!--
+
+Note
+
+1. Mark the PR as draft until it's ready to be reviewed.
+2. Always add/update tests for any changes unless you have a good reason.
+3. Always update the documentation to reflect the changes made in the PR.
+4. Make a new commit to resolve conversations instead of `push -f`.
+5. To resolve merge conflicts, merge master instead of rebasing.
+6. Use "request review" to notify the reviewer after making changes.
+7. Only a reviewer can mark a conversation as resolved.
+
+-->