Add design proposal issue template

Author: mckaragoz

.github/ISSUE_TEMPLATE/design_proposal.md

@@ -0,0 +1,45 @@
+---
+name: "🧠 Design Proposal"
+about: Propose a high-level design for a new component, flow, or architectural change
+title: "[Design]: "
+labels: design
+assignees: ""
+---
+
+## 🧠 Summary
+Briefly describe the concept or design you're proposing.
+
+---
+
+## 🎯 Goals
+What problem does this design solve?
+What are the objectives?
+
+---
+
+## 🧩 Proposed Architecture
+Describe how this feature or change should work:
+- Components involved  
+- Flow diagrams (optional)  
+- Key abstractions  
+- Input/output expectations
+
+---
+
+## 🧪 Alternatives Considered
+List alternative designs and why they were not chosen.
+
+---
+
+## 🔥 Risks / Trade-offs
+Any potential drawbacks or complexities?
+
+---
+
+## 🔗 Related Issues
+(Optional) Provide related bugs, features, or discussions.
+
+---
+
+## ✔ Additional Notes
+Add anything else that may help the maintainers evaluate this proposal.