add: pull request template

.github/pull_request_template.md

@@ -0,0 +1,25 @@
+# Add Title of Your Pull Request
+
+## Description
+Add a brief description of the changes you have made in this pull request.
+
+## Related Issue
+Add the issue number that you have fixed in this pull request. If there is no issue, create one before submitting the 
+pull request.
+
+## Type of Change
+
+- [ ] Bug fix
+- [ ] New feature
+- [ ] Breaking change
+- [ ] This change requires a documentation update
+
+## Checklist:
+
+- [ ] I have read the [CONTRIBUTING.md](CONTRIBUTING.md) document.
+- [ ] My code follows the code style of this project.
+- [ ] I have performed a self-review of my own code.
+- [ ] I have commented my code, particularly in hard-to-understand areas.
+- [ ] I have made corresponding changes to the documentation.
+- [ ] My changes generate no new warnings.
+- [ ] My changes have been formatted using `black` and `ruff`.