update README.md

README.md

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 # Conv
+
+使用FFmpeg合并音频，图片和字幕生成视频的工具
+
+支持Whisper语音识别
+
+### 使用
+下载[FFmpeg](https://github.com/BtbN/FFmpeg-Builds/releases/latest)并设置环境变量($PATH:ffmpeg/bin)
+
+Scoop:
 ```
-cargo clean
-cargo update
-cargo build
-cargo build --release
+scoop install ffmpeg
+```
+
+运行conv.exe
+
+### 构建
+安装
+[CMake](https://cmake.org/download/)
+[Rustup](https://rustup.rs/)
+[LLVM](https://releases.llvm.org/download.html)
+[C++ 构建工具](https://visualstudio.microsoft.com/visual-cpp-build-tools/)
+
+Scoop:
+```
+scoop install cmake rustup llvm
 ```