Introduce PR template

.github/PULL_REQUEST_TEMPLATE.md

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+### Description
+
+<!--  Describe your changes in detail. Also mention how to handle breaking changes if there are any -->
+
+### Additional Notes
+
+- This PR fixes or works on following ticket(s): [SIRI-](https://scireum.myjetbrains.com/youtrack/issue/SIRI-)
+- This PR is related to PR: <!-- URL of PR if applicable, remove otherwise -->
+
+### Checklist
+
+- [ ] Code change has been tested and works locally
+- [ ] Code was formatted via IntelliJ and follows SonarLint & [best practices](https://scireum.myjetbrains.com/youtrack/articles/MISC-A-16/CodeStyle-JavaDoc)
+- [ ] Patch Tasks: Is local execution of Patch Tasks necessary? If so, please also mark the PR with the tag.