docs: add pull request template (#154)

.github/pull_request_template.md

@@ -0,0 +1,34 @@
+## Summary
+
+<!-- Brief description of what this PR does. 1-3 bullet points. -->
+
+- 
+
+## Changes
+
+<!-- What was changed and how. List specific modifications. -->
+
+- 
+
+## Screenshots
+
+<!-- If applicable, add screenshots or GIFs showing before/after. Delete this section if not needed. -->
+
+| Before | After |
+|:---:|:---:|
+|  |  |
+
+## Testing
+
+<!-- How to verify this PR works correctly. Delete if not applicable. -->
+
+```bash
+bun run typecheck
+bun test
+```
+
+## Related Issues
+
+<!-- Link related issues. Use "Closes #123" to auto-close on merge. -->
+
+<!-- Closes # -->