setupArgParser method
Sets up the argument parser with command-specific options
Implementation
@override
void setupArgParser() {
super.setupArgParser();
argParser
..addOption('title', help: 'Plugin display title.')
..addOption('description',
help: 'Capability description.',
defaultsTo: 'A shared Vyuh capability.')
..addOption('class-name',
help: 'Public plugin class (defaults to <Name>Plugin).');
}