Add pull request template.

.github/pull_request_template.md

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+## Pull Request
+
+### Description
+[Provide a brief description of the changes or features implemented in this pull request.]
+
+### Related Issue(s)
+[If applicable, mention any related issues or tasks that this pull request addresses.]
+
+### Checklist
+Please make sure to review and check the following before submitting your pull request. Remove any items that are not applicable.
+
+- [ ] You have added the text `[version:minor]` if new functionality has been added; `[version:major]` if there are any breaking changes.
+- [ ] Unit tests have been added or updated to ensure proper functionality.
+- [ ] Documentation has been updated to reflect the changes (if applicable).
+- [ ] All commit messages are clear and descriptive.
+
+### Additional Notes
+[Include any additional information or notes that may be helpful for reviewers.]
+
+### Reviewer(s)
+[Tag any specific person or team responsible for reviewing this pull request, if applicable.]