Add readme and docs for v2

[loopmode]

No description provided.

[tracker1]

Note: the readme example, at least in NPM seems wrong... there's a callback method defined, but not a successCallback, and doesn't seem to be any wiring between the button and the Stateful component, unless that's implicit.

[loopmode]

@tracker1 good catch with the name of the callback in the readme. Gotta fix it.

About wiring: unless you provide a render function and wire things up yourself, it is indeed implicitly and automagically wired. Lots of documentation to be done.

And about it being implicit: normally i don't like implicit and magic, but this approach, for this use case, has worked for me for years in different projects.

Cheers tracker1 - thanks for chiming in!

[loopmode]

Fixed successCallback in Readme via 95cfaf5