Do I need a website for a mobile app?
Having a website allows you to improve the search for your app on Google, Bing and the various other search engines. Even if you don't have huge amounts of content on the website to begin with, it's much better than nothing.
How do I use a website as an app?
App 3: Google Chrome; Developer: Google
Here's how you do it: Open Chrome and go to the website you want to create a shortcut (lite app) for. Then tap on the menu button (three dots) on the top-left. Finally, on the slide-out panel, select Add to Home screen.