Add documentation

[pablomaurer]

Hey cool stuff. thanks for sharing! Issue to track initial documentation.

[kgrosvenor]

Needs documentation...

[shanemgrey]

Could make out what this does by going over the src, but it would be helpful to include at least a little about what it can be used for in the README.md

[olegmdev]

Thank you for your feedbacks. I'll add docs on the next week!

[TristanBrotherton]

I'd love to just see a basic example as well, would make it tremendously helpful. Thank you!

[wareor]

Hi.
How can I delay the entry of a tour until after of $digest is finished?