create chap-client.py with initial example code

chap-client.py

+#!/usr/bin/env python2
+
+import xmlrpclib
+
+s = xmlrpclib.ServerProxy('http://localhost:8000')
+print s.pow(2,3)  # Returns 2**3 = 8
+print s.add(2,3)  # Returns 5
+print s.div(5,2)  # Returns 5//2 = 2
+
+# Print list of available methods
+print s.system.listMethods()