added another showcase :)

Author: gedankenstuecke

README.md

@@ -80,6 +80,7 @@ If you want travis tests, you can take a look at:
 ## Showcase
 
 - [fohlen.github.io](http://fohlen.github.io/) by @[Lennard Berger](https://github.com/Fohlen)
+- [gedankenstuecke.github.io](http://gedankenstuecke.github.io) by @[Bastian Greshake](https://github.com/gedankenstuecke)
 
 > open a [pull-request](https://github.com/sergiokopplin/indigo/pulls) if you want your site in this awesome list