SELFBLUE. Added an initial slider and a wizard for new users of the app

When the user downloads the app from the stores, before arriving at the registration and login screen, he must scroll through a series of slides that describe the main features of the app. The slides are visible only once when he download the app.
When the user registers and executes the first login, a welcome page appears, personalized with his name. The page also contains information that guides the user in creating the wallet.
After the user creates the wallet a thank you page appears and the indication of the vending operator to whom the wallet created refers.