add pr template

Author: lucarin91

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,19 @@
+### Motivation
+
+<!-- Why this pull request? -->
+
+### Change description
+
+<!-- What does your code do? -->
+
+### Additional Notes
+
+<!-- Link any useful metadata: Jira task, GitHub issue, ... -->
+
+### Reviewer checklist
+
+- [ ] PR addresses a single concern.
+- [ ] PR title and description are properly filled.
+- [ ] Changes will be merged in `main`.
+- [ ] Changes are covered by tests.
+- [ ] Logging is meaningful in case of troubleshooting.