Feature Request: Improve documentation for working with presets and limitations of Favorites

[jzajac2]

I have several questions, hopefully the output of this is I can submit a PR for some doc updates:

1. the node-sonos-http-api allows for a folder named presets in it (for organization purposes) and it is the preferred way so perhaps we should update accordingly (I believe it even hot loads them / don't have to restart the server when you add new json files to presets folder)
2. When I have a .json file in presets folder where the "favorite" name contains more than one word for example "All Duran Duran Albums", utterances don't seem to be able to capture that. If I trim it down to one word like "Duran" (then change the name of the corresponding Favorite in sonos controller app to "Duran"), then it works. Now, I prefer Favorites as I had some issues with regular the presets, but if another way supports my desire to have longer/more explicit utterances then I'm open to it. I also see a test:
   console.log('Calling preset by JSON'); return sonosProxy.preset('{"players": [{ "roomName": "Kitchen", "volume": 30}], "state": "PAUSED", "pauseOthers": false}');

That seemed to work!
Now with Favorites, I am limited to the one word utterances, it PLAYS, however I get
ERROR Invalid music service
and Alexa responds

Starting playing artist favorite all duran duran albums