chore: import upstream snapshot with attribution

examples/basic/hello_world.py

@@ -0,0 +1,20 @@
+import asyncio
+
+from agents import Agent, Runner
+
+
+async def main():
+    agent = Agent(
+        name="Assistant",
+        instructions="You only respond in haikus.",
+    )
+
+    result = await Runner.run(agent, "Tell me about recursion in programming.")
+    print(result.final_output)
+    # Function calls itself,
+    # Looping in smaller pieces,
+    # Endless by design.
+
+
+if __name__ == "__main__":
+    asyncio.run(main())