Ack to xeus-cling

README.md

 # CPFT
 
 [![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/git/https%3A%2F%2Fi10git.cs.fau.de%2Fmohr%2Fcpft.git/HEAD)
+
+Thanks to the people of [xeus-cling](https://github.com/jupyter-xeus/xeus-cling) for making it possible to run our C++ examples inside Jupyter notebooks.