docs: pull request template

.github/pull_request_template

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+### Definition of Ready
+
+- [ ] I am happy with the code
+- [ ] Short description of the feature/issue is added in the pr description
+- [ ] PR is linked to the corresponding user story
+- [ ] Acceptance criteria are met
+- [ ] All open todos and follow ups are defined in a new ticket and justified
+- [ ] Deviations from the acceptance criteria and design are agreed with the PO and documented.
+- [ ] No debug or dead code
+- [ ] Critical parts are tested automatically
+- [ ] Where possible E2E tests are implemented
+- [ ] Documentation/examples are up-to-date
+- [ ] All non-functional requirements are met
+- [ ] Functionality of the acceptance criteria is checked manually on the dev system.
+