Add pull request template

Signed-off-by: Jakub Jelen <[email protected]>

.github/PULL_REQUEST_TEMPLATE.md

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+#### Description
+
+<!--  The description should give a general overview of the goal of the PR.
+
+Individual commit message should highlight important changes that people may
+want to know about year later when sorting thorough as commits are the changelog.
+-->
+
+<!-- Note: it is best to make pull requests from a branch rather than from main -->
+
+#### Checklist
+
+<!-- replace [ ] with [x] to select -->
+<!-- (delete not applicable items) -->
+
+- [ ] Code modified for feature
+- [ ] Test suite updated with functionality tests
+- [ ] Test suite updated with negative tests
+- [ ] Documentation updated
+
+
+#### Reviewer's checklist:
+
+- [ ] Any issues marked for closing are addressed
+- [ ] There is a test suite reasonably covering new functionality or modifications
+- [ ] This feature/change has adequate documentation added
+- [ ] Code conform to coding style that today cannot yet be enforced via the check style test
+- [ ] Commits have short titles and sensible commit messages