[Feature] Support online inference (#64)

Signed-off-by: Gaohan123 <gaohan19@huawei.com>

docs/user_guide/examples/online_serving/README.md

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+# Online serving Example of vLLM-omni for Qwen2.5-omni
+
+Source <https://github.com/vllm-project/vllm-omni/blob/main/examples\online_serving\README.md>.
+
+
+## 🛠️ Installation
+
+Please refer to [README.md](https://github.com/vllm-project/vllm-omni/blob/main/README.md)
+
+## Run examples (Qwen2.5-omni)
+
+Launch the server
+```bash
+vllm serve Qwen/Qwen2.5-Omni-7B --omni --port 8091
+```
+
+If you have custom stage configs file, launch the server with command below
+```bash
+vllm serve Qwen/Qwen2.5-Omni-7B --omni --port 8091 --stage-configs-path /path/to/stage_configs_file
+```
+
+Get into the example folder
+```bash
+cd examples/online_serving
+```
+
+Send request via python
+```bash
+python openai_chat_completion_client_for_multimodal_generation.py
+```
+
+Send request via curl
+```bash
+bash run_curl_multimodal_generation.sh
+```

docs/user_guide/examples/online_serving/openai_chat_completion_client_for_multimodal_generation.md

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+# OpenAI Chat Completion Client For Multimodal Generation
+
+Source <https://github.com/vllm-project/vllm-omni/blob/main/examples\online_serving\openai_chat_completion_client_for_multimodal_generation.py>.
+
+``````py
+--8<-- "examples\online_serving\openai_chat_completion_client_for_multimodal_generation.py"
+``````