GUACAMOLE-682: added comment with example to build with RADIUS
GUACAMOLE-682: added comment with example to build with RADIUS

jmuehlner/incubator-guacamole-client,jmuehlner/incubator-guacamole-client,necouchman/incubator-guacamole-client,necouchman/incubator-guacamole-client,glyptodon/guacamole-client,jmuehlner/incubator-guacamole-client,mike-jumper/incubator-guacamole-client,glyptodon/guacamole-client,necouchman/incubator-guacamole-client,mike-jumper/incubator-guacamole-client,glyptodon/guacamole-client,glyptodon/guacamole-client,glyptodon/guacamole-client,necouchman/incubator-guacamole-client,mike-jumper/incubator-guacamole-client,jmuehlner/incubator-guacamole-client,mike-jumper/incubator-guacamole-client