added Credits

tikz/histogram-large-1d-dataset/README.md

@@ -1,3 +1,9 @@
 Compiled example
 ----------------
 ![Example](histogram-large-1d-dataset.png)
+
+Credits
+--------
+
+Thanks to [esdd](http://tex.stackexchange.com/users/43317/esdd) who helped me
+to get the LaTeX part work (see [tex.SE answer](http://tex.stackexchange.com/a/194966/5645))