Manifest Simplest https://w3c.github.io/manifest/#using-a-link-element-to-link-to-a-manifest

manifest.webmanifest

{
  "name": "Donate App",
  "description": "This app helps you donate to worthy causes.",
  "icons": [{
    "src": "https://www.sammobile.com/wp-content/uploads/2017/03/app_icon.png",
    "sizes": "192x192"
  }]
}