chore: add concise PR template

Author: dndungu

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,25 @@
+# PR Title
+
+## Summary
+- What: Briefly describe the change
+- Why: Problem it solves / value
+- How: Key changes (bullets)
+
+## Testing
+- [ ] Unit tests added/updated
+- [ ] Manual/Integration verified
+- [ ] CI passes locally (tests + lint)
+
+## Risk/Impact
+- Breaking changes: yes/no (explain)
+- Migration notes (if any)
+
+## Checklist
+- [ ] Small, logical commits
+- [ ] Docs/README updated (if user-facing)
+- [ ] Backwards compatible (or documented)
+- [ ] Security/Privacy reviewed (if applicable)
+- [ ] Linked issue(s) / references
+
+## Notes
+- Screenshots/logs (if relevant)