Create pull_request_template.md

.github/pull_request_template.md

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+## Description
+
+Describe your changes here:
+
+- What's the problem solved (briefly, since the issue is where this is elaborated in more detail).
+- Introduce your implementation approach in a way that helps reviewing it well.
+
+## Resolved issues
+
+Note the Jira/Launchpad issue(s) resolved by this PR (`Fixes|Resolves ...`).
+
+## Documentation
+
+- [ ] Automated tests are included for the changed functionality in this PR. If to be merged without tests, please elaborate why.
+- [ ] Necessary documentation is provided for the changed functionality in this PR (tests are documentation, too).
+
+## Tests
+
+- [ ] Steps to follow for reviewer to run & manually test are provided.
+- [ ] A list of what tests were run and on what platform/configuration is provided.