Need to make SDK Categories

I am new to sdk and I am coming from direct publisher.. I am using the deep linking example from git hub.  I just want to be able to add categories from a json feed like in direct publisher:  

"categories": [{
		"name": "Recently Added",
		"order": "chronological",
		"query": "recently-added"
	}, {
		"name": "Movies About Music",
		"order": "chronological",
		"query": "movies about music"
	},

For some reason this is not covered in any of the roku scenegraph videos and anyone that had a question about this in the forum hasn't been answered.  I don't understand why this is so hard to get information about this?  Does no one know how to do it? Any help will be greatly appreciated.