Document a simple use case from start to finish

[andrewperry]

Thanks for the amazing module.

Maybe the readme makes more sense for people who are already using handlebars, but I am looking to implement it in products to make use of your work with i18n, so it's unclear for me.

The readme doesn't seem to provide a simple use case of passing both the language variables AND the regular handlebars variables AND the 18n template to the library to return the appropriate language output with the regular handlebars placeholders filled in.

Maybe this could be added in the Quick Example or under the API section?