Add CHECKLIST.md

CHECKLIST.md

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+# Project Progress Checklist
+
+## 📋 Master Checklist
+Last Updated: [Date]
+
+### 🔴 Not Started
+- [ ] [Task 1]
+- [ ] [Task 2]
+
+### 🟡 In Progress
+- [ ] [Task 3] (Started: Date)
+- [ ] [Task 4] (Started: Date)
+
+### 🟢 Completed
+- [x] [Task 5] (Completed: Date)
+- [x] [Task 6] (Completed: Date)
+
+### ⏸️ Blocked
+- [ ] [Task 7] (Blocked by: [Reason])
+
+## 📈 Progress Summary
+- **Overall Progress**: XX%
+- **Completed**: XX tasks
+- **In Progress**: XX tasks
+- **Not Started**: XX tasks
+- **Blocked**: XX tasks