Feature: first-meet intro describing app's features

[liinahamari]

When user opens up application first time he\she should see slideshow describing app's core features.
Every slide should contain title, description, picture (representing device screen with specific application state) and some unique (comparing to other slides) background color.
User should be able to skip intro.
Title and description should be translated to app's provided languages.
This functionality, definitely, should be implemented via AppIntro library.
Some UI tests should be added.
TODO: Think about "splash screen" proxy with as fast as possible screen drawing mechanism.