Add: pull request template

.github/pull_request_template.md

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+
+## Description
+<!-- Provide a brief description of the changes or additions in this pull request. -->
+
+## How has this been tested?
+- [ ] Unit tests
+- [ ] Integration tests
+- [ ] Manual testing
+
+## Type of change
+- [ ] Bug fix
+- [ ] New feature
+- [ ] Breaking change
+- [ ] Documentation update
+- [ ] Other (please describe):
+
+## Checklist
+<!-- Please ensure that you have completed the following before submitting your pull request. Delete any tasks that are not applicable. -->
+
+- [ ] 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 if necessary.
+- [ ] I have added tests that prove my fix is effective or that my feature works.