update readme

examples/swarm_agent.py

@@ -0,0 +1,34 @@
+from swarm import Swarm, Agent
+from openai import OpenAI
+from httpx import Client
+import os
+
+client = Swarm(
+    client=OpenAI(
+        http_client=Client(
+            headers={
+                "Invariant-Authorization": "Bearer "
+                + os.getenv("INVARIANT_API_KEY", "")
+            }
+        ),
+        base_url="https://explorer.invariantlabs.ai/api/v1/proxy/weather-swarm-agent/openai",
+    )
+)
+
+
+def get_weather():
+    return "It's sunny."
+
+
+agent = Agent(
+    name="Agent A",
+    instructions="You are a helpful agent.",
+    functions=[get_weather],
+)
+
+response = client.run(
+    agent=agent,
+    messages=[{"role": "user", "content": "What's the weather?"}],
+)
+
+print(response.messages[-1]["content"])