Add TensorFlow instructions and walkthrough

[humphd]

I've moved from Caffe/Digits to TensorFlow in my own work, and I want to update this to show how to do the same tasks with TensorFlow.

Given the hard work by @BirkhoffLee translating the original, I don't want to break what we already have. I'm debating whether to integrate it into the current document, or start a new one. I think it's nice to see how transferable the approach is across ML frameworks and technologies, so doing it in the same doc might make sense.

Thoughts?

[BirkhoffLee]

Start a new one, will translate when have free time

[humphd]

https://js.tensorflow.org/ and https://github.com/tensorflow/tfjs-examples/tree/master/mobilenet will let me do this in JS and the browser now.

[BirkhoffLee]

How's the progress? I really would love to see a Tensorflow approach here!

[humphd]

@BirkhoffLee I did all the work, then they redid TF to change it, and I haven't gone back to update it. I'd still like to do it, probably with tensorflow.js or the node binding. I need to find some time. I'll see if I can.

[humphd]

In many ways, https://js.tensorflow.org/tutorials/webcam-transfer-learning.html is close to what this needs, for those wanting to jump in now.

[BirkhoffLee]

Cool! Gotta check it out.