Add a Pull Request Template file for the repository

Add a Pull Request Template file for the repository to help create
standardised Pull Requests in n3tuk.

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,14 @@
+## Checklist
+
+Please confirm the following checks:
+
+- [ ] My pull request follows the guidelines set out in `CONTRIBUTING.md`.
+- [ ] I have performed a self-review of my code and run any tests locally to check.
+- [ ] I have added tests that prove my changes are effective and work correctly.
+- [ ] I have made corresponding changes to the documentation as needed.
+- [ ] I have checked my code and corrected any misspellings.
+- [ ] Each commit in this pull request has meaningful subject & body for context.
+- [ ] I have squashed all "fix(up)" commits to provide a clean code history.
+- [ ] My pull request has an appropriate title and description for context.
+- [ ] I have linked this pull request to other issues or pull requests as needed.
+- [ ] I have added `type/...`, `changes/...`, and 'release/...' labels as needed.