update doc

Author: alexcheng1982

README.md

@@ -2,10 +2,14 @@
 
 [![build](https://github.com/LLMAgentBuilder/chat-agent-ui/actions/workflows/build.yml/badge.svg)](https://github.com/LLMAgentBuilder/chat-agent-ui/actions/workflows/build.yml)
 
-A simple UI to test conversational agents. It's built using [assistant-ui](https://www.assistant-ui.com/) with a [LocalRuntime](https://www.assistant-ui.com/docs/runtimes/custom/local).
+A simple UI to test conversational agents. It's built
+using [assistant-ui](https://www.assistant-ui.com/) with
+a [LocalRuntime](https://www.assistant-ui.com/docs/runtimes/custom/local).
 
 The API must be available at `/chat`.
 
 The UI is available at `/webjars/chat-agent-ui/index.html`.
 
-See an example at [here](https://github.com/JavaAIDev/simple-ai-agent).
+See an example at [here](https://github.com/JavaAIDev/simple-ai-agent).
+
+![Chat agent UI](./chat-agent-ui.png)