So,
 the first and the most funny thing is to create a layout for my app. I 
think the best way to do this is simply draw on a piece of paper or a 
monitor, like below. There should be a lovely header, the german text 
which should be analysed by the app, the “wordlist” and the details 
about the selected word. Every word will be clickable, and according to 
this the “selected word textbox” will be changing.
The
 only problem is that there is some wasted space, so I re-designed the 
layout a bit. I also found out that displays’ are usually wider the 
higher, so it is reasonable to stretch it a bit to the left and to the 
right.
And
 finally there is need for welcome-page, where users can enter their 
German text. Just a textbox, a button or two, and some introducing text 
about the app.
Finding
 the right colours will be also a bit tricky. There is a lot of stuff 
out there about choosing colours, I’ve found two interesting resources: 
an infographics about color sentiments with some stats, and the Color Scheme Designer, which can help creating nice colour sets (and export 
them many formats).
