Add simple Unix socket example by Piet van Oostrum.
diff --git a/Demo/sockets/unixclient.py b/Demo/sockets/unixclient.py
new file mode 100644
index 0000000..a0d80f6
--- /dev/null
+++ b/Demo/sockets/unixclient.py
@@ -0,0 +1,10 @@
+# Echo client demo using Unix sockets
+# Piet van Oostrum
+from socket import *
+FILE = 'blabla'
+s = socket(AF_UNIX, SOCK_STREAM)
+s.connect(FILE)
+s.send('Hello, world')
+data = s.recv(1024)
+s.close()
+print 'Received', `data`