Add deep learning ref architecture chainer

Author: PeterCLu

articles/machine-learning/service/how-to-train-chainer.md

@@ -211,3 +211,5 @@ In this article, you trained and registered a deep learning, neural network usin
 * [Tune hyperparameters](how-to-tune-hyperparameters.md)
 
 * [Track run metrics during training](how-to-track-experiments.md)
+
+* [View reference architecture for distributed deep learning training in Azure](/azure/architecture/reference-architectures/ai/training-deep-learning)