Add tutorial for lifecycle node (#1237)

This PR adds a comprehensive tutorial on ROS 2 lifecycle nodes for the rclnodejs library. The tutorial explains the lifecycle state machine, provides practical examples, and covers best practices for implementing lifecycle nodes in JavaScript.

### Key Changes:
- **New lifecycle nodes tutorial** with detailed explanations, code examples, and troubleshooting guidance
- **README update** to include a link to the new tutorials director

Fix: #1236

Author: minggangw

README.md

@@ -25,6 +25,7 @@ rclnodejs.init().then(() => {
 - [Installation](#installation)
 - [rclnodejs-cli](#rclnodejs-cli)
 - [API Documentation](#api-documentation)
+- [Tutorials](./tutorials/)
 - [Electron-based Visualization](#electron-based-visualization)
 - [Using TypeScript](#using-rclnodejs-with-typescript)
 - [ROS2 Interface Message Generation](#ros2-interface-message-generation)