Update README.md

Author: s1thu

README.md

@@ -1,14 +1,79 @@
-todo-cli/
-├── cmd/
-│ └── root.go # Entry point CLI command handlers
-├── todo/
-│ ├── task.go # Task struct and helpers
-│ ├── manager.go # Add, List, Done, Delete logic (pure functions)
-│ ├── storage.go # Load/Save to JSON file
-│ ├── task_test.go # Unit tests for task logic
-│ ├── manager_test.go # Unit tests for business logic
-│ └── storage_test.go # Unit tests for file I/O (can be mocked)
-├── tasks.json # File to store tasks (auto-created)
-├── go.mod
-├── main.go # Main entry — delegates to cmd/root.go
-└── README.md # Project instructions
+# 📝 To-Do CLI Application in Go
+
+A simple and testable **Command Line To-Do List App** written in Go using clean architecture. It supports adding, listing, completing, and deleting tasks directly from your terminal.
+
+This app is built for learning and demonstrating:
+
+- Go programming best practices
+- Modular code structure
+- Unit testing
+- File-based persistence
+- CLI design with Cobra (planned)
+
+---
+
+## 🚀 Features
+
+- ✅ Add new tasks
+- 📋 List all tasks (sorted by ID)
+- ✅ Mark tasks as completed
+- ❌ Delete tasks
+- 💾 Persist tasks to local JSON file
+- 🧪 Unit tested using Go’s `testing` package
+
+---
+
+## 🧱 Tech Stack
+
+| Component    | Tech                       |
+| ------------ | -------------------------- |
+| Language     | Go 1.21+                   |
+| CLI Parser   | Cobra _(coming soon)_      |
+| File Storage | Local JSON File            |
+| Testing      | Built-in `testing` package |
+| CI/CD        | GitHub Actions (Go CI)     |
+
+---
+
+## 📁 Project Structure
+
+```
+to_do_cli/
+├── cmd/                 # (optional) Cobra CLI commands
+├── todo/                # Core business logic and models
+│   ├── task.go
+│   ├── manager.go
+│   ├── storage.go
+│   ├── *_test.go
+├── main.go              # Entry point (delegates to cmd or logic)
+├── tasks.json           # File for persisting task data
+├── go.mod               # Go module definition
+├── README.md            # Project overview and usage
+└── .github/workflows/   # GitHub Actions CI pipeline
+```
+
+---
+
+## 🧪 Running Tests
+
+```bash
+go test ./...
+```
+
+Or run with verbose output:
+
+```bash
+go test -v ./...
+```
+
+---
+
+## 🤝 Contributing
+
+Feel free to fork and contribute! This project is open for improvements, experimentation, and learning.
+
+---
+
+## 📄 License
+
+MIT