Update README.md

Author: lennet

README.md

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 # NeuralNetwork
 A Swift PlaygroundBook about Neural Networks
 
+![Training of a Neural Network](Screenshots/PlaygroundDemo.gif)
+
 # Attribution:
  - The XOR image in the Hello World chapter is based on the work by Heron [https://de.wikipedia.org/wiki/Datei:Xor-gate-en.svg](https://de.wikipedia.org/wiki/Datei:Xor-gate-en.svg). Licensed under creative commons by attribution 3.0 license
  - The Iris Dataset in the Playground chapter provided by Dua, D. and Graff, C. (2019). UCI Machine Learning Repository [http://archive.ics.uci.edu/ml](http://archive.ics.uci.edu/ml). Irvine, CA: University of California, School of Information and Computer Science.