A2A_MCP example execution

@holtskinner Hi! Thank you so much for providing us with all these great code samples! :)
I have a quick question about running the A2A_MCP project.
Are we supposed to create an A2AClient to run directly the Orchestrator?
I am asking this since only the Orchestrator communicates with all the other agents via the
A2AClients encapsulated in each node, but there's no code sample to run the Orchestrator which activates the entire workflow.

Can you please clarify if this is supposed to be the the entry point for the entire project or am I missing anything else please ? :)

Thanks in advance,
Veronica!

查看 A2A_MCP 專案的結構，以了解 Orchestrator 和 A2AClient 的角色。該 issue 要求提供程式碼範例或文件，說明如何執行 Orchestrator 以啟用 workflow。檢查 repository 中是否已有進入點、README 檔案或範例腳本。目標是為首次貢獻者釐清執行流程。

由索引模型根據 Issue 內容生成。