Update README.md

Author: xiaohu2015

examples/VAE/README.md

@@ -1 +1,5 @@
 # Variational Autoencoders (VAEs)
+- [Variational Autoencoder in TensorFlow](https://jmetzen.github.io/2015-11-27/vae.html)
+- [Understanding Variational Autoencoders (VAEs) from two perspectives: deep learning and graphical models.](https://jaan.io/what-is-variational-autoencoder-vae-tutorial/)
+- [Introduction to variational autoencoders](https://home.zhaw.ch/~dueo/bbs/files/vae.pdf)
+