feat: 添加 GateServer 模块并创建服务端基础框架

- 新增 GateServer 类，实现基本的 TCP 服务器功能
- 创建服务端启动脚本，定义数据处理和事件监听逻辑
- 添加 package.json 文件，配置项目信息和启动脚本

GateServer/start.js

@@ -0,0 +1,22 @@
+const GateServer = require('./index');
+
+const server = new GateServer(8080, '127.0.0.1');
+
+server.on('connection', (socket) => {
+    console.log('A new client has connected');
+});
+
+server.on('data', (socket, data) => {
+    console.log('Received data:', data.toString());
+    socket.write('Echo: ' + data);
+});
+
+server.on('end', (socket) => {
+    console.log('Client has disconnected');
+});
+
+server.on('error', (err) => {
+    console.error('Server error:', err);
+});
+
+server.start();