[coffeescript/de] Add german version of coffeescript introduction

This adds a translation of the English coffeescript intro to German.
@PFischbeck Doesn't `kompiliert`  sound like it's compiled into some sort of executable? At least that's the notion I do have when hearing it. When triggering a build step that would transpile CoffeeScript I wouldn't use the word `kompilieren`, would you? I do like the `umgewandelt` you are using at the other line where it's used but I'm not too sure if it fits here.