{
  "name": "サンプルアプリ名",
  "description": "どのようなアプリであるかの説明",
  "display": "fullscreen",
  "icons": [{
    "src": "/handsonjs/ch17/ex4/icon.png",
    "sizes": "256x256"
  }],
  "start_url": "/handsonjs/ch17/ex4/"
}