[Flutter]启用Windows支持

flutter开启windows开发支持，需要执行如下命令：

flutter config --enable-windows-desktop

出现以下结果就是配置成功了

C:\Users\karry_bai>flutter config --enable-windows-desktop

┌─────────────────────────────────────────────────────────┐
│ A new version of Flutter is available!                  │
│                                                         │
│ To update to the latest version, run "flutter upgrade". │
└─────────────────────────────────────────────────────────┘
Setting "enable-windows-desktop" value to "true".

You may need to restart any open editors for them to read new settings.