Useful Links:

• Web App Manifest - Browser Support: http://caniuse.com/#feat=web-app-manifest
• MDN Article on the Web App Manifest (includes List of all Properties): https://developer.mozilla.org/en-US/docs/Web/Manifest
• A detailed Web App Manifest Explanation by Google: https://developers.google.com/web/fundamentals/engage-and-retain/web-app-manifest/
• More about the "Web App Install Banner" (including Requirements): https://developers.google.com/web/fundamentals/engage-and-retain/app-install-banners/