add py example

rust/exo_pyo3_bindings/examples/mdns_responder.py

@@ -0,0 +1,12 @@
+from exo_pyo3_bindings import RustNetworkingHandle, Keypair
+from asyncio import run
+
+async def main():
+    nh = await RustNetworkingHandle.create(Keypair.generate_ed25519(), "mdns_example")
+    recv = await nh.get_connection_receiver()
+    while True:
+        print(await recv.receive())
+
+
+if __name__ == "__main__":
+    run(main())