Support download models from www.modelscope.cn (#1588)

docs/source/models/supported_models.rst

@@ -81,4 +81,18 @@ Alternatively, you can raise an issue on our `GitHub <https://github.com/vllm-pr
         output = llm.generate("Hello, my name is")
         print(output)
 
+    To use model from www.modelscope.cn
+
+    .. code-block:: shell
+
+       $ export VLLM_USE_MODELSCOPE=True
+
+    .. code-block:: python
+
+        from vllm import LLM
+
+        llm = LLM(model=..., revision=..., trust_remote_code=True)  # Name or path of your model
+        output = llm.generate("Hello, my name is")
+        print(output)
+
     If vLLM successfully generates text, it indicates that your model is supported.