added a test echo client

echo_test.rb

@@ -0,0 +1,18 @@
+#!/usr/bin/env ruby -wKU
+
+require 'socket'      # Sockets are in standard library
+
+hostname = 'localhost'
+port = 7000
+
+s = TCPSocket.open(hostname, port)
+
+print "What to echo? "
+q = gets
+s.print(q)
+
+while true
+  line = s.gets   # Read lines from the socket
+  puts "Got Echo: " + line.chop      # And print with platform line terminator
+end
+s.close               # Close the socket when done