Create a tutorial to similar to Keras Layers/Modules but with TF-Slim

[DEKHTIARJonathan]

Very similar to this file with Keras: https://github.com/tensorlayer/tensorlayer/blob/master/example/tutorial_keras.py

We should create the same thing with TF-Slim

[zsdonghao]

We have the SlimNetsLayer ~ It that what you mean?

[DEKHTIARJonathan]

I just mean about creating a small example using it

[2wins]

@DEKHTIARJonathan Please check the PR. Thanks.