feat: add example project highlighting basic functionality

examples/example-project/.gitignore

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+node_modules

examples/example-project/README.md

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+# Quai Network Example Project
+
+This project demonstrates basic wallet and transaction operations using the Quai Network JavaScript SDK.
+
+## Features
+
+- Generates HD wallets from mnemonics
+- Creates zone-specific addresses
+- Fetches blockchain data
+- Constructs, signs, and verifies transactions
+- Demonstrates protocol expansion number queries
+
+## Prerequisites
+
+- Node.js (v14 or later)
+- npm or yarn
+- Access to Quai Network RPC endpoint
+
+## Installation
+
+```bash
+npm install
+# or
+yarn install
+```
+
+## Usage
+
+```bash
+npm start
+# or
+yarn start
+```
+
+The script will:
+1. Generate a new random wallet
+2. Create a Cyprus1 zone address
+3. Fetch latest block data
+4. Create and verify a test transaction
+
+## Code Structure
+
+- `index.ts`: Main script demonstrating Quai Network SDK usage
+- Uses TypeScript for type safety
+- Implements error handling for network operations
+
+## Important Notes
+
+- This is a demonstration project - do not use generated keys in production
+- Transactions are constructed but not broadcast to the network
+- Replace hardcoded addresses with your own test addresses
+
+## Resources
+
+- [Quai Network Docs](https://docs.quai.network)
+- [quais SDK Reference](https://github.com/dominant-strategies/quais-6.js)