Add PR template

.github/pull_request_template.md

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+
+The PR should be in _Draft_ state during development. As soon as it's finished, it should be marked as _Ready for review_ and a reviewer should be chosen.
+
+See also: [Writing A Great Pull Request Description](https://www.pullrequest.com/blog/writing-a-great-pull-request-description/)
+
+
+### Purpose
+
+What this PR is intended to do and why this is desirable.
+
+Example: 
+
+> Adds support for AAA in BBB, as requested by several people in issue #XX.
+
+
+### Short description
+
+A short description of the chosen approach to achieve the purpose.
+
+Example:
+
+> - Added authentication option _Some authentication_ to _some module_.
+> - Added support for _Some authentication_ to _some content provider_.
+> - Added UI support for _Some authentication_ in account settings.
+
+Related information (links to Android docs and other resources that help to understand/review
+the changes) can also be put here.
+
+
+### Checklist
+
+- [ ] The PR has a proper title, description and label.
+- [ ] I have [self-reviewed the PR](https://patrickdinh.medium.com/review-your-own-pull-requests-5634cad10b7a).
+- [ ] I have added documentation to complex functions and functions that can be used by other modules.
+- [ ] I have added reasonable tests or consciously decided to not add tests.
+