pr template added (#23)

.github/pull_request_template.md

@@ -0,0 +1,25 @@
+---
+name: Pull request template
+about: Create a pull request to contribute to our software
+title: ""
+labels: ""
+assignees: ""
+---
+
+## Pull Request 
+
+### Description
+
+### Reference
+
+Issues: 
+
+### Definition of Done
+- [ ] Acceptance criteria are met
+- [ ] Build/Test workflow has successfully finished
+- [ ] Release notes are complemented
+- [ ] Documentation is complemented (operator manual, system specification)
+- [ ] Frontend is locally smoke-tested
+- [ ] Side branches are deleted
+- [ ] Board is updated
+- [ ] Infrastructure is adjusted