Coming to your homescreen soon: your own app. | Photo: Allison Johnson / The Verge "There's an app for that" was the promise of the App Store from the very beginning. The app that will get your phone to do the thing you want it to? It's just a few taps away. The tagline wasn't strictly true - I'm still waiting for that one perfect grocery list app. Still, apps shaped the modern smartphone into what it is today. We spend all day, every day inside of apps - scrolling, listening, and tapping unti