Update README.md

Signed-off-by: zz990099 <771647586@qq.com>

Author: zz990099

README.md

@@ -48,7 +48,15 @@
 
 ### Enviroment Build
 
-1. 使用`docker`来构建运行环境
+1. 下载`foundationpose_cpp`repo
+```bash
+git clone git@github.com:zz990099/foundationpose_cpp.git
+cd foundationpose_cpp
+git submodule init
+git submodule update
+```
+
+2. 使用`docker`来构建运行环境
   ```bash
     cd ${foundationpose_cpp}/docker
     bash build_docker.sh --container_type=trt8 # trt10, jetson_trt8, jetson_trt10