[Docs] Setup Documentation System and Re-organize Dependencies (#49)

Signed-off-by: SamitHuang <285365963@qq.com>

docs/user_guide/getting_started/quickstart.md

@@ -0,0 +1,56 @@
+# Quickstart
+
+This guide will help you get started with vLLM-omni.
+
+## Installation
+
+Use Docker to keep consistent basic environment (Optional, Recommended)
+
+```bash
+docker run --gpus all --ipc=host --network=host -v $source_dir:$container_dir --rm --name $container_name -it nvcr.io/nvidia/pytorch:25.01-py3 bash
+```
+
+Set up basic uv environment
+
+```bash
+pip install uv
+uv venv --python 3.12 --seed
+source .venv/bin/activate
+```
+
+Install vLLM
+
+```bash
+uv pip install vllm==0.11.0 --torch-backend=auto
+```
+
+Install vLLM-omni
+
+```bash
+git clone https://github.com/vllm-project/vllm-omni.git
+cd vllm_omni
+uv pip install -e .
+```
+
+## Run examples (Qwen2.5-omni)
+
+Get into the example folder
+
+```bash
+cd examples/offline_inference/qwen_2_5_omni
+```
+
+Then run.
+
+```bash
+bash run.sh
+```
+
+The output audio is saved in ./output_audio
+
+## Next Steps
+
+- Read the [architecture documentation](../../contributing/design_documents/vllm_omni_design.md)
+- Check out the [API reference](../../api/overview.md)
+- Explore the [examples](../examples/index.md)
+