https://jakearchibald.com/2014/offline-cookbook/ (caching strategies)
https://weather-pwa-sample.firebaseapp.com/step-08/ (sample app, using self.clients.claim();)
https://codelabs.developers.google.com/codelabs/your-first-pwapp/#7 (google guide for the above weather app, client manifest, app install banner)
https://developers.google.com/web/fundamentals/engage-and-retain/app-install-banners/ (Chrome app install banner notification (did user install the app))