Add PR template

.github/pull_request_template.md

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+# Description
+
+<!-- Please include a summary of the change. Please also include relevant motivation and context. -->
+
+<!-- Please link the issue which will be fixed (if any) here: -->
+Fixes # (issue)
+
+## Type of change
+
+<!-- Please delete options that are not relevant. -->
+
+- [ ] Bug fix (non-breaking change which fixes an issue)
+- [ ] New feature (non-breaking change which adds functionality)
+- [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
+- [ ] This change requires a documentation update
+
+## Checklist:
+
+- [ ] My code follows the style guidelines of this project
+- [ ] I have performed a self-review of my own code
+- [ ] I have commented my code, particularly in hard-to-understand areas
+- [ ] I have made corresponding changes to the documentation
+- [ ] I have added tests that prove my fix is effective or that my feature works
+- [ ] New and existing unit tests pass locally with my changes