Main command without actions

[BigBoyBarney]

Hi! Thanks for this shard!

I'd like to have the app print the help message if it's run without arguments and have all actions done through subcommands.

Example:

class Main < Cling::Command
 def setup : Nil
 @name = "main"
 @description = "main description"
 end

 def run(arguments : Cling::Arguments, options : Cling::Options) : Nil
 puts help_template
 end
end

class SubcommandOne < Cling::Command
 def setup : Nil
 @name = "subcommand-one"
 @description = "Subcommand one"
 end

 def run(arguments : Cling::Arguments, options : Cling::Options) : Nil
 # stuff to do
 end
end

main = Main.new
main.add_command(SubcommandOne.new)
main.execute(ARGV)

This works, but the help message looks like this

Usage:
	main

Commands:
	subcommand-one

Would it be possible to print a placeholder for the commands like this?

Usage:
	main <command>

Commands:
	subcommand-one

Thanks in advance!