docs: close #55, add PR template (#70)

.github/PULL_REQUEST_TEMPLATE/pull_request_template.md

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+## Description
+
+<!-- Provide a description of what your PR introduces or changes. -->
+
+e.g. This PR refactors the X submodule, applying Y's algorithm to improve Z by K percent.
+
+## Related Issues
+
+<!-- Does this PR directly address an existing GitHub issue? If not, you may want to consider creating an issue first. -->
+
+- Closes #0, a short description of the linked issue.
+
+## Checklist
+
+<!-- Please mark items as completed where appropriate. e.g. [x]. -->
+
+- [ ] This PR has sufficient test coverage.
+
+## Additional Comments
+
+<!-- Feel free to add any additional comments related to this PR. -->
+
+No additional comments.