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📚 docs(readme): 添加 Rust 调用 V4L2 与 Fltk 播放摄像头画面的安装和调用方法

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# Rust 调用 V4L2 与 Ftlk 播放摄像头画面
## 从零开始安装一个项目需要多费劲
```shell
# 无法确定具体需要的包体
apt install libfltk1.3-dev
apt install build-essential libfltk1.1 libfltk1.1-dev
apt install pkg-config libxft-dev
apt install libxext-dev libxinerama-dev libxcursor-dev libxfixes-dev libpango1.0-dev libglib2.0-dev libcairo2-dev libv4l-dev v4l2loopback-utils
```
## 调用方法
`./rust_v4l2 <video_device> <width> <height> <interval>`