feat: 初始化 NFC 读卡器项目

- 添加 Electron 主进程和渲染进程
- 实现读卡器连接、断开和读取卡片 ID 功能
- 添加自定义窗口标题栏和窗口控制
- 实现简洁美观的用户界面
- 添加项目文档 README.md

main.js

@@ -0,0 +1,59 @@
+const { app, BrowserWindow, ipcMain } = require('electron')
+
+function createWindow() {
+  const win = new BrowserWindow({
+    width: 440,
+    height: 400,
+    frame: false,
+    transparent: false,
+    backgroundColor: '#f9f9f9',
+    roundedCorners: true,
+    webPreferences: {
+      nodeIntegration: true,
+      contextIsolation: false,
+    },
+  })
+
+  win.loadFile('index.html')
+}
+
+app.whenReady().then(() => {
+  createWindow()
+
+  app.on('activate', () => {
+    if (BrowserWindow.getAllWindows().length === 0) {
+      createWindow()
+    }
+  })
+})
+
+app.on('window-all-closed', () => {
+  if (process.platform !== 'darwin') {
+    app.quit()
+  }
+})
+
+ipcMain.on('window-minimize', () => {
+  const focusedWindow = BrowserWindow.getFocusedWindow()
+  if (focusedWindow) {
+    focusedWindow.minimize()
+  }
+})
+
+ipcMain.on('window-maximize', () => {
+  const focusedWindow = BrowserWindow.getFocusedWindow()
+  if (focusedWindow) {
+    if (focusedWindow.isMaximized()) {
+      focusedWindow.unmaximize()
+    } else {
+      focusedWindow.maximize()
+    }
+  }
+})
+
+ipcMain.on('window-close', () => {
+  const focusedWindow = BrowserWindow.getFocusedWindow()
+  if (focusedWindow) {
+    focusedWindow.close()
+  }
+})