Create pull_request_template.md (#152)

Author: astomodynamics

PR_TEMPLATE/pull_request_template.md

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+## Summary
+<!-- Provide 2-3 bullet points summarizing the key changes and their purpose -->
+- 
+- 
+- 
+
+## Changes
+<!-- List the specific changes made, grouped by component or functionality -->
+- **Component/Feature**: Description of changes
+- **Another Component**: Description of changes
+- 
+
+## Test Plan
+<!-- Checklist of tests to validate the changes -->
+- [ ] Test item 1
+- [ ] Test item 2
+- [ ] Test item 3
+
+## Additional Notes
+<!-- Any additional context, design decisions, or concerns for reviewers -->