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How to Publish Your App to Google Play?
How to Set Up an Android App Manifest?
There is not much information about this on the internet.
Are Twitter/Instagram/Facebook apps actually PWAs packaged into native apps? Are there other notable examples?
A great place to get started with a Hosted Web App is PWABuilder.com. This tool can be used online or from the CLI. Part of it creates a service worker and stuff, but it also creates the Cordova projects for Android and iOS.
I have used PWABuilder just to create a starting point. Eventually combining the generated iOS and Android projects into one for iOS, Android and Windows. Because it is Cordova you can use plugins as well.
Update 2019
Now Google is open to PWA apps on Google Playstore,hence one could use tools like PWA2APK inorder to convert existing PWA's to Google Playstore ready Apps. The Android APK (PWApk) generated by the tool can be uploaded to Playstore.
This tool has been tweeted out by Alex Russel, one of the inventors of PWA.
https://twitter.com/slightlylate/status/1093681791297187840