Could we add a link to this great explanation of CNN layers?

[vitali-fedulov]

Presently the CNN chapter nearly omits an explanation what convolutional layers are. A link to this article would neatly fill the gap: https://towardsdatascience.com/applied-deep-learning-part-4-convolutional-neural-networks-584bc134c1e2

The article also introduces the concept of data augmentation, which is missing in the Gluon docs at the moment.