chore: add pull request template (#608)

* Create pull_request_template.md

* Update pull_request_template.md

* Update pull_request_template.md

.github/pull_request_template.md

@@ -0,0 +1,12 @@
+## Checklist
+
+_check the box if it is not applicable to your changes_
+- [ ] The title of my PR follows the [conventional commits](https://www.conventionalcommits.org/en/v1.0.0/) convention
+- [ ] I have updated the README with the necessary documentation
+- [ ] I have added unit tests
+- [ ] I have added [end-to-end tests](test/test_skim.py)
+- [ ] I have linked all related issues or PRs
+- [ ] I have re-generated the completions and manpage using `cargo xtask compgen` and `cargo xtask mangen`
+
+## Description of the changes
+