Add A2A protocol support for CrewAI (Issue #2796)

Co-Authored-By: Joe Moura <joao@crewai.com>

examples/a2a_protocol_example.py

@@ -0,0 +1,59 @@
+"""
+Example of using the A2A protocol with CrewAI.
+
+This example demonstrates how to:
+1. Create an agent with A2A protocol support
+2. Start an A2A server for the agent
+3. Execute a task via the A2A protocol
+"""
+
+import asyncio
+import os
+import uvicorn
+from threading import Thread
+
+from crewai import Agent
+from crewai.a2a import A2AServer, InMemoryTaskManager
+
+
+agent = Agent(
+    role="Data Analyst",
+    goal="Analyze data and provide insights",
+    backstory="I am a data analyst with expertise in finding patterns and insights in data.",
+    a2a_enabled=True,
+    a2a_url="http://localhost:8000",
+)
+
+
+def start_server():
+    """Start the A2A server."""
+    task_manager = InMemoryTaskManager()
+    
+    server = A2AServer(task_manager=task_manager)
+    
+    uvicorn.run(server.app, host="0.0.0.0", port=8000)
+
+
+async def execute_task_via_a2a():
+    """Execute a task via the A2A protocol."""
+    await asyncio.sleep(2)
+    
+    result = await agent.execute_task_via_a2a(
+        task_description="Analyze the following data and provide insights: [1, 2, 3, 4, 5]",
+        context="This is a simple example of using the A2A protocol.",
+    )
+    
+    print(f"Task result: {result}")
+
+
+async def main():
+    """Run the example."""
+    server_thread = Thread(target=start_server)
+    server_thread.daemon = True
+    server_thread.start()
+    
+    await execute_task_via_a2a()
+
+
+if __name__ == "__main__":
+    asyncio.run(main())