[Feature request] Bring back example pdf document

[theFireProject]

Feature Request

I don't want to suggest to change the app start-up behaviour with the file manager showing up. In case the file manager is closed without opening a file (by pressing back on the navigation bar), there should be the old example document "Lorem ipsum..." again instead of an empty view.

User Benefit

I think it looks better than just nothing and it was a useful feature to try out the handling of the app. F.e. trying interaction with the app by zooming in and out using different gestures, as well as checking how well the document is rendered while doing so. (It is possible to zoom with two fingers, or by double tap and holding with one finger, and then moving the finger up and downwards to zoom.)