add pull request template

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,83 @@
+# 📌 Summary
+
+Provide a brief description of the change and the reasoning behind it.
+
+---
+
+# 👥 Reviewers
+
+## ✅ Required Reviewers
+- @username1  
+- @username2  
+
+## 🧩 Optional Reviewers
+- @username3  
+- @username4  
+
+(Feel free to add/remove as needed.)
+
+---
+
+# 🔍 Related Issue(s)
+
+- Closes #
+- Related to #
+
+---
+
+# 🛠️ What Changed?
+
+Describe the main changes in this PR:
+-
+-
+-
+
+---
+
+# 🧪 Testing
+
+Describe how you verified functionality:
+
+- [ ] Unit tests added
+- [ ] Existing tests pass
+- [ ] Manual testing performed
+
+**Steps to reproduce/test:**
+1.  
+2.  
+3.  
+
+---
+
+# 🐍 Python Code Quality Checklist
+
+Before requesting review, ensure:
+
+- [ ] I ran **`make format`**
+- [ ] I ran **`make lint`**
+- [ ] I ran **`make typecheck`**
+- [ ] I ran **`make test`**
+- [ ] All CI checks pass
+- [ ] Code follows project style & conventions
+- [ ] New functions/classes include docstrings
+- [ ] Public APIs are typed (type hints)
+
+---
+
+# 📚 Documentation
+
+- [ ] Code comments updated
+- [ ] README updated (if needed)
+- [ ] User-facing docs updated (if needed)
+
+---
+
+# 📈 Screenshots / Logs (optional)
+
+Attach outputs, plots, logs, or GIFs here.
+
+---
+
+# 🙏 Additional Notes
+
+Anything else reviewers should know?