[RFC] New help message stlye

[BigBoyBarney]

Hi! Thank you for this package! It's really cool!

I've been tinkering a bit with the help message to make it look a bit more friendly.

Currently, help messages look like this:

configure -n | --name string
authorise
decrypt -i|--input string [-o|-- output string] [--r bool]

I knocked out a quick prototype, but before I spend time properly implementing it, what do you think of the following?

Usage:
	my_app <command> [options]

Commands:
	configure    -n|--name string
	authorise
	decrypt      -i|--input string [-o|-- output string] [--r bool]

Or even

Usage:
	my_app <command> [options]

Commands:
	configure    Configures XYZ
	authoriss    Gets authorisation token
	decrypt      Decrypts game files

Options:
	global options would go here

And then when printing help message for specific command, it would then replace the usage and options parts accordingly.

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Cheers!

[GoNZooo]

Hey, sorry for getting to this very late. If you're still interested in implementing this I'm all for the output you proposed. :)