[WIP] Create a basic structure for phrases development

We create a simple basic structure to organize the application, and simple tests to start with development of phrases application.

**Only merge after #9  is merged**
Just linking #11 
> I always ignore this file, but @malukenho says that it is recommended versioning this. What do you say?

[As of the doc][1], it is recommended to add the *lock file* into versioning.

[1]: https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file