Create pr_template.md

.github/pr_template.md

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+## Description
+
+Please include a summary of the change and which issue is fixed. Also include relevant motivation and context.
+
+- Fixes #(issue number)
+
+## 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 update
+- [ ] Tests 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
+- [ ] My changes generate no new warnings
+- [ ] New and existing unit tests pass locally with my changes
+- [ ] I have maintained a clean commit history by using the necessary Git commands
+- [ ] I have checked that my code does not cause any merge conflicts
+
+## Screenshots (if applicable)
+
+Add screenshots to help explain the changes (if necessary).