Add support for "drinker" and "maker" user modes. #8
Description
App feature idea: provide entry points on first launch for the user to select if they are a drinker or a maker, and if they are a drinker, then they can look up brews by url or qr code to see how that batch was made.
Makers can provide public and private info which is available to drinkers.
Drinkers can rate and give feedback on batches.