CLI help ${project.artifactId}
GAV ${project.groupId}:${project.artifactId}:${project.version}

command line syntax (eBNF):

    ${program.name} { help | declare_service }

help ::= help
       | -help
       | --help
       | /help
       | /?
       | ?

            show this screen

declare_service ::= service <class_name> host <ip_dns> port <port_no> add


