improve docker

docker/README.md

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+# Docker setup
+
+This docker setup is tested on Windows 10.
+
+make sure you are under this directory yourworkspace/Hunyuan3D-2.1/docker
+
+Build docker image:
+
+```
+docker build -t hunyuan3d21:latest .
+```
+
+Run docker image at the first time:
+
+```
+docker run -it --name hy3d21 -p 7860:7860 --gpus all hunyuan3d21 python gradio_app.py --port 7860
+```
+
+After first time:
+```
+docker start hy3d21
+docker exec -it hy3d21 python gradio_app.py --port 7860
+```
+
+Stop the container:
+```
+docker stop hy3d21
+```
+
+You can find the demo link showing in terminal, such as `http://0.0.0.0:7860`, then you cuold access `http://127.0.0.1:7860` from your host machine.
+
+Some notes:
+1. the total built time might take more than one hour.
+2. the total size of the built image will be more than 70GB.