Article on the model-zoo example for MNIST

I downloaded your MNIST example using the CNN and published an article on linked-in going through each step. Not sure where to let you know on the site. I'm hoping to do future follow ups as I experiment with Flux. I'd appreciate any feedback.

https://www.linkedin.com/pulse/creating-deep-neural-network-model-learn-handwritten-digits-mike-gold/

The issue names no repository file, test, or entry point. Start by reading the linked LinkedIn article and checking the model-zoo documentation for an appropriate place; a concrete documentation change is needed before implementation can begin.

Written by the indexing model from the issue text.