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Resolves
What Github issue does this resolve (please include link)?
Proposed Changes
making PWA installable, ref https://developer.mozilla.org/en-US/docs/Web/Progressive_web_apps/Guides/Making_PWAs_installable
NOTE: the icon files are copied from the Android APK bundle.
Reason for Changes
Web users can install it as an app.
Test Coverage
Please show how you have added tests to cover your changes
Browser Coverage
Check the OS/browser combinations tested (At least 2)
Mac
Windows
Chromebook
iPad
Android Tablet