Create PULL_REQUEST_TEMPLATE.md

PULL_REQUEST_TEMPLATE.md

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+Many thanks to contributing to Sarek!
+
+Please fill in the appropriate checklist below (delete whatever is not relevant).
+These are the most common things requested on pull requests (PRs).
+
+## PR checklist
+ - [ ] This comment contains a description of changes (with reason)
+ - [ ] If you've fixed a bug or added code that should be tested, add tests!
+ - [ ] Ensure the test suite passes (`./scripts/test.sh -p docker -t ALL`).
+ - [ ] Documentation in `docs` is updated
+ - [ ] `CHANGELOG.md` is updated
+ - [ ] `README.md` is updated
+
+**Learn more about contributing:** https://github.com/SciLifeLab/Sarek/blob/master/.github/CONTRIBUTING.md