(Quick Reference)
                add-proxy
Purpose
Adds a proxy configuration that Grails can use when communicating over the internet such as with the 
install-plugin command.
The proxy configuration can be activated with the 
set-proxy command.
Examples
grails add-proxy client --host=proxy-server --port=4300 
       --username=guest --password=guestDescription
Usage:
grails add-proxy [name] --host=[server] --port=[port] 
       --username=[username]* --password=[password]*Arguments:
name - The name of the proxy configuration 
host - The server host 
port - The server port 
username (optional) - The server username 
password (optional) - The server password