manifest.json

{
    "dir": "ltr",
    "lang": "en-US",
    "name": "CNC math",
    "short_name": "CNC math",
    "start_url": "./app.html",
    "display": "standalone",
    "background_color": "#282c3a",
    "description": "for machinists and programmers",
    "icons": [{
      "src": "assets/icon-057x057.png",
      "sizes": "57x57",
      "type": "image/png"
    }, {
      "src": "assets/icon-072x072.png",
      "sizes": "72x72",
      "type": "image/png"
    }, {
      "src": "assets/icon-076x076.png",
      "sizes": "76x76",
      "type": "image/png"
    }, {
      "src": "assets/icon-114x114.png",
      "sizes": "114x114",
      "type": "image/png"
    }, {
      "src": "assets/icon-120x120.png",
      "sizes": "120x120",
      "type": "image/png"
    }, {
      "src": "assets/icon-144x144.png",
      "sizes": "144x144",
      "type": "image/png"
    }, {
      "src": "assets/icon-152x152.png",
      "sizes": "152x152",
      "type": "image/png"
    }, {
      "src": "assets/icon-180x180.png",
      "sizes": "180x180",
      "type": "image/png"
    }]
  }