Create pull_request_template.md (#224)

* Create pull_request_template.md

* Update with conventions

* Automated autoyapf fixes
---------

Co-authored-by: github-actions <github-actions@github.com>

.github/workflows/pull_request_template.md

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+## Describe your changes
+
+
+## Describe any testing you have performed
+*Consider adding example code to [examples](https://github.com/vais-ral/CILViewer/tree/pr-template/Wrappers/Python/examples)*
+
+
+## Link relevant issues
+
+
+## Checklist when you are ready to request a review
+
+- [ ] I have performed a self-review of my code
+- [ ] I have added docstrings in line with the guidance in the [CIL developer guide](https://tomographicimaging.github.io/CIL/nightly/developer_guide.html)
+- [ ] I have implemented unit tests that cover any new or modified functionality
+- [ ] CHANGELOG.md has been updated with any functionality change
+- [ ] Request review from all relevant developers
+- [ ] Change pull request label to 'waiting for review' 
+
+## Contribution Notes
+- [ ] The content of this Pull Request (the Contribution) is intentionally submitted for inclusion in CILViewer (the Work) under the terms and conditions of the [Apache-2.0 License](https://spdx.org/licenses/Apache-2.0.html)
+- [ ] I confirm that the contribution does not violate any intellectual property rights of third parties
+
+Qt contributions should follow Qt naming conventions i.e. camelCase method names.
+
+VTK contributions should follow VTK naming conventions i.e. PascalCase method names.