Merge branch 'patch-3' into 'master'

Added Theano & Keras to the list of machine learning modules

See merge request sccs/docs.it4i.cz!183

docs.it4i/software/machine-learning/introduction.md

@@ -17,3 +17,11 @@ $ ml Tensorflow
 ```
 
 Read more about available versions at the [TensorFlow page](tensorflow/).
+
+## Theano
+
+Read more about available versions at the [Theano page](theano/).
+
+## Keras
+
+Read more about available versions at the [Keras page](keras/).