Create pull request template for contributions

Add a pull request template for contributors to fill out.

Author: asong56

.github/PULL_REQUEST_TEMPLATE/template.md

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+## Summary
+
+<!-- Briefly describe what this PR does and why. -->
+
+Closes #
+
+---
+
+## Type of Change
+
+- [ ] Bug fix
+- [ ] New feature
+- [ ] Refactor (no behaviour change)
+- [ ] Documentation
+- [ ] Chore (dependency update, config, CI, etc.)
+
+---
+
+## What Changed
+
+<!-- Describe the key changes. Be specific enough that a reviewer understands the approach without reading every line. -->
+
+---
+
+## How to Test
+
+<!-- List the steps a reviewer should follow to verify this works correctly. -->
+
+1. 
+2. 
+3. 
+
+---
+
+## Screenshots
+
+<!-- If this affects UI or visual output, add before/after screenshots. Delete this section if not applicable. -->
+
+---
+
+## Checklist
+
+- [ ] I have read [CONTRIBUTING.md](../CONTRIBUTING.md)
+- [ ] My changes follow the project's code style and conventions
+- [ ] I have tested my changes manually (list browsers / environments above if relevant)
+- [ ] I have updated documentation where needed
+- [ ] I have not introduced new external runtime dependencies without prior discussion
+- [ ] This PR is focused on a single concern — unrelated changes are in a separate PR