feat(examples): add comprehensive SQLite Sync examples README

Author: Gioee

examples/README.md

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+# SQLite Sync Examples
+
+This directory contains comprehensive examples demonstrating SQLite Sync in various environments and use cases. Each example showcases offline-first data synchronization across multiple devices using SQLite AI's sync capabilities.
+
+## Examples Overview
+
+### [simple-todo-db/](./simple-todo-db/)
+**Basic CLI Example - Getting Started**
+- Command-line demonstration using SQLite CLI
+- Shows fundamental SQLite Sync concepts and workflow
+- Multi-device collaborative editing with conflict resolution
+- Offline scenarios and network synchronization
+- Perfect for understanding core sync mechanics
+
+### [sport-tracker-app/](./sport-tracker-app/)
+**Advanced Web App - Production Patterns**
+- React/TypeScript web application with Vite
+- Demonstrates secure authentication with Access Tokens
+- Row-Level Security (RLS) implementation for data isolation
+- Multi-user scenarios (athletes and coaches)
+- WASM SQLite with sync extension
+- Production-ready security patterns
+
+### [swift-multiplatform-app/](./swift-multiplatform-app/)
+**Swift iOS/macOS Integration**
+- Cross-platform Swift app for iOS and macOS
+- CloudSync XCFramework integration guide
+- Native mobile and desktop sync capabilities
+- Xcode project setup and security configuration
+
+### [to-do-app/](./to-do-app/)
+**React Native/Expo Mobile App**
+- Cross-platform mobile app (iOS/Android)
+- Expo framework with SQLite sync
+- Simple task management with categories
+- Offline-first mobile development patterns
+- **Note**: Uses basic connection strings for demo purposes only
+
+## Getting Started
+
+1. **Begin with**: `simple-todo-db/` for core concepts
+2. **Production web apps**: Use `sport-tracker-app/` patterns
+3. **Native mobile**: Choose `swift-multiplatform-app/` or `to-do-app/`
+
+Each example includes detailed setup instructions, code explanations, and security considerations. See the individual README files for specific implementation details.
+
+---
+
+**Note**: For generic extension loading guides please refer to the [SQLite Extension Guide](https://github.com/sqliteai/sqlite-extensions-guide) repository