Add .example + .examples sub command (#60)

[ntwcklng]

Example file:

const args = require('./')

args
.option('deploy', 'deploy')
.option(['D', 'deps'], 'dependencies')
.example('usage 1', 'desc 1')
.examples([
  {usage: 'usage 2', description: 'desc 2'},
  {usage: 'usage 3', description: 'desc 3'},
  {usage: 'usage 4', description: 'desc 4'},
  {usage: 'usage 5', description: 'desc 5'}
])

args.parse(process.argv)

output:

  Usage: example.js [options] [command]

  Commands:

    help  Display help

  Options:

    -d, --deploy   deploy
    -D, --deps     dependencies
    -h, --help     Output usage information
    -v, --version  Output the version number

  Examples:

    usage 1  desc 1
    usage 2  desc 2
    usage 3  desc 3
    usage 4  desc 4
    usage 5  desc 5

[ntwcklng]

Do you want the output to be the same as now -h examples?
e.g.

- description 1
$ usage 1

- description 2
$ usage 2

...

[leo]

@ntwcklng Yes! 😊 Don't forget the colors, the newlines between description and usage and the indentation.

[ntwcklng]

Should we include the $ by default in the usage example?

edit: indentation is fixed in 633ba9a

[leo]

Sweet! Thanks 😊