docs: Add tutorial on deploying vLLM model with KServe (#2586)

Signed-off-by: Yuan Tang <terrytangyuan@gmail.com>

docs/source/index.rst

@@ -70,6 +70,7 @@ Documentation
 
    serving/distributed_serving
    serving/run_on_sky
+   serving/deploying_with_kserve
    serving/deploying_with_triton
    serving/deploying_with_docker
    serving/serving_with_langchain

docs/source/serving/deploying_with_kserve.rst

+.. _deploying_with_kserve:
+
+Deploying with KServe
+============================
+
+vLLM can be deployed with `KServe <https://github.com/kserve/kserve>`_ on Kubernetes for highly scalable distributed model serving.
+
+Please see `this guide <https://kserve.github.io/website/latest/modelserving/v1beta1/llm/vllm/>`_ for more details on using vLLM with KServe.