Adds pull request template

.github/pull_request_template.md

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+# Description
+
+Please include a summary of the change. Please also include relevant motivation and context. List any dependencies that are required for this change.
+
+## Checklist
+
+- [ ] My code follows the [style guidelines](/CONTRIBUTING.md) of this project.
+- [ ] I have performed a self-review of my own code.
+- [ ] I have made corresponding changes to the documentation.
+- [ ] I have added tests that validate the behaviour of the software.
+- [ ] I validated that new and existing unit tests pass locally with my changes.
+- [ ] Any dependent changes have been merged and published in downstream modules.