docs: add pull_request_template.md

.github/pull_request_template.md

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+# Description
+
+Please include a summary of the changes and any relevant motivation and context.
+
+<!-- Close any related issues. Delete if not relevant -->
+
+- Closes #
+- Fixes #
+- Resolves #
+
+## 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)
+- [ ] Documentation (updates documentation)
+
+# Checklist:
+
+- [ ] I have performed a self-review of my code
+- [ ] I have commented my code, particularly in hard-to-understand areas
+- [ ] I have made corresponding changes to the documentation