coffee app

Want an app written that offers people the ability to rate coffee at their favourite coffee place. The app needs to allow people to log in and see the rating of various coffee outlets right across the world and directions on how to find the place for example, if Im in New York and I want to find great coffee in Manhattan then I can log into the app that will use the GPS in my phone to say which rated coffee places are close to me and what other people have rated their coffee experience as from these places with some comments as well. I can then go to the best place and rate it myself as to how much I enjoyed the cofee