Update documentation to reflect more the current API

[Barbapapazes]

related to #46

Hello,

This issue will be used to track documentation update that we need to provide.

PR welcomes to help! (and do not hesitate to comment if you have more idea)

Tasks

Preview Give feedback

1. Sub command
2. Async command
3. Setup function
4. Cleanup function
5. Sub command can be a function
6. Sub command can be lazy loaded
7. Add the CLI to the bin

[nozomuikuta]

@Barbapapazes

It would be worth adding "how to make the CLI available as 'binary'".
I mean like, how to set up the CLI as bin?

// in development
node mycommand arg

// when published
mycli mycommand arg

[Barbapapazes]

@Barbapapazes

It would be worth adding "how to make the CLI available as 'binary'".
I mean like, how to set up the CLI as bin?

// in development
node mycommand arg

// when published
mycli mycommand arg

Thanks for the feedback, that's a great idea!

[Barbapapazes]

@pi0, do you think we could add a section they use citty to the docs to highlight projects (like nuxt-ng) to help user to create their own?