usage method

@override String usage()

Returns a sample usage of the Verb

Implementation

@override
String usage() {
  return 'configure block syntax config:block:<action>:@<atSign> \n e.g config:block:add:@alice \n view syntax config:show:<type> \n e.g config:shoe:allow \n configure set syntax \n e.g. config:set:<configName>=<configValue> \n config:reset(or)print:<configName>';
}