Examples: add MCP simple chatbot with SSE

[szj2ys]

There is only stdio example in single client, but how to use sse in a single client i don't figuire out, could you add an example in README.md? thanks a lot.

[hfyydd]

"amap-amap-sse": {
  "url": "https://mcp.amap.com/sse?key=your_key",
  "transport": "sse",
}    just only need to set "transport" to "sse",and it is working

[knightswatch3]

Are you trying to stream from the server ? @szj2ys
@hfyydd Can we not do this via createReactAgent ?
What if I don't want to use multipleServer class ?