Add langgraph compatibility section (#718)

README.md

@@ -38,6 +38,13 @@ in [LangChain.js](https://js.langchain.com/docs/ecosystem/langserve).
   locally (or call the HTTP API directly)
 - [LangServe Hub](https://github.com/langchain-ai/langchain/blob/master/templates/README.md)
 
+## ⚠️ LangGraph Compatibility
+
+LangServe is designed to primarily deploy simple Runnables and wok with well-known primitives in langchain-core.
+
+If you need a deployment option for LangGraph, you should instead be looking at [LangGraph Cloud (beta)](https://langchain-ai.github.io/langgraph/cloud/) which will
+be better suited for deploying LangGraph applications.
+
 ## Limitations
 
 - Client callbacks are not yet supported for events that originate on the server