First draft of the introduction

Rewrote the introduction as a usecase.

Pulled the introduction into a separate file.

This is a first draft but thought I'd get out a general idea of the introduction I had out as soon as possible.
"it", "our lives", I am not sure if this is correct. It is like a single device contains most of all our lives, but you want to say that for each person, most of their lives are contained in their device. Therefore, maybe say "After all, these devices contain most of our lives", or to avoid the use of "contains": 
"After all, big parts of our lives are stored on our devices by means of all kinds of data, like pictures, chat histories, browser histories, etc."