Add a cross language RPC example

examples/example_client.py

@@ -0,0 +1,25 @@
+from __future__ import print_function
+
+import capnp
+import test_capnp
+import socket
+
+def example_client():
+    loop = capnp.EventLoop()
+    
+    c = socket.create_connection(('localhost', 49999))
+    read_stream = capnp.FdAsyncIoStream(c.fileno())
+
+    client = capnp.RpcClient(loop, read_stream)
+
+    ref = test_capnp.TestSturdyRefObjectId.new_message()
+    ref.tag = 'testInterface'
+    cap = client.restore(ref)
+    cap = cap.cast_as(test_capnp.TestInterface)
+
+    remote = cap.foo(i=5)
+    response = loop.wait_remote(remote)
+
+    assert response.x == 'foo'
+
+example_client()