Update

etc/icons/android/res/mipmap-anydpi-v26/ic_launcher.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+  <background android:drawable="@mipmap/ic_launcher_background"/>
+  <foreground android:drawable="@mipmap/ic_launcher_foreground"/>
+  <monochrome android:drawable="@mipmap/ic_launcher_monochrome"/>
+</adaptive-icon>

etc/icons/ios/Contents.json

@@ -0,0 +1,134 @@
+{
+  "images": [
+    {
+      "filename": "AppIcon@2x.png",
+      "idiom": "iphone",
+      "scale": "2x",
+      "size": "60x60"
+    },
+    {
+      "filename": "AppIcon@3x.png",
+      "idiom": "iphone",
+      "scale": "3x",
+      "size": "60x60"
+    },
+    {
+      "filename": "AppIcon~ipad.png",
+      "idiom": "ipad",
+      "scale": "1x",
+      "size": "76x76"
+    },
+    {
+      "filename": "AppIcon@2x~ipad.png",
+      "idiom": "ipad",
+      "scale": "2x",
+      "size": "76x76"
+    },
+    {
+      "filename": "AppIcon-83.5@2x~ipad.png",
+      "idiom": "ipad",
+      "scale": "2x",
+      "size": "83.5x83.5"
+    },
+    {
+      "filename": "AppIcon-40@2x.png",
+      "idiom": "iphone",
+      "scale": "2x",
+      "size": "40x40"
+    },
+    {
+      "filename": "AppIcon-40@3x.png",
+      "idiom": "iphone",
+      "scale": "3x",
+      "size": "40x40"
+    },
+    {
+      "filename": "AppIcon-40~ipad.png",
+      "idiom": "ipad",
+      "scale": "1x",
+      "size": "40x40"
+    },
+    {
+      "filename": "AppIcon-40@2x~ipad.png",
+      "idiom": "ipad",
+      "scale": "2x",
+      "size": "40x40"
+    },
+    {
+      "filename": "AppIcon-20@2x.png",
+      "idiom": "iphone",
+      "scale": "2x",
+      "size": "20x20"
+    },
+    {
+      "filename": "AppIcon-20@3x.png",
+      "idiom": "iphone",
+      "scale": "3x",
+      "size": "20x20"
+    },
+    {
+      "filename": "AppIcon-20~ipad.png",
+      "idiom": "ipad",
+      "scale": "1x",
+      "size": "20x20"
+    },
+    {
+      "filename": "AppIcon-20@2x~ipad.png",
+      "idiom": "ipad",
+      "scale": "2x",
+      "size": "20x20"
+    },
+    {
+      "filename": "AppIcon-29.png",
+      "idiom": "iphone",
+      "scale": "1x",
+      "size": "29x29"
+    },
+    {
+      "filename": "AppIcon-29@2x.png",
+      "idiom": "iphone",
+      "scale": "2x",
+      "size": "29x29"
+    },
+    {
+      "filename": "AppIcon-29@3x.png",
+      "idiom": "iphone",
+      "scale": "3x",
+      "size": "29x29"
+    },
+    {
+      "filename": "AppIcon-29~ipad.png",
+      "idiom": "ipad",
+      "scale": "1x",
+      "size": "29x29"
+    },
+    {
+      "filename": "AppIcon-29@2x~ipad.png",
+      "idiom": "ipad",
+      "scale": "2x",
+      "size": "29x29"
+    },
+    {
+      "filename": "AppIcon-60@2x~car.png",
+      "idiom": "car",
+      "scale": "2x",
+      "size": "60x60"
+    },
+    {
+      "filename": "AppIcon-60@3x~car.png",
+      "idiom": "car",
+      "scale": "3x",
+      "size": "60x60"
+    },
+    {
+      "filename": "AppIcon~ios-marketing.png",
+      "idiom": "ios-marketing",
+      "scale": "1x",
+      "size": "1024x1024"
+    }
+  ],
+  "info": {
+    "author": "iconkitchen",
+    "version": 1
+  }
+}

etc/icons/web/README.txt

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+Add this to your HTML <head>:
+
+    <link rel="icon" href="/favicon.ico" sizes="any">
+    <link rel="apple-touch-icon" href="/apple-touch-icon.png">
+
+Add this to your app's manifest.json:
+
+    ...
+    {
+      "icons": [
+        { "src": "/favicon.ico", "type": "image/x-icon", "sizes": "16x16 32x32" },
+        { "src": "/icon-192.png", "type": "image/png", "sizes": "192x192" },
+        { "src": "/icon-512.png", "type": "image/png", "sizes": "512x512" },
+        { "src": "/icon-192-maskable.png", "type": "image/png", "sizes": "192x192", "purpose": "maskable" },
+        { "src": "/icon-512-maskable.png", "type": "image/png", "sizes": "512x512", "purpose": "maskable" }
+      ]
+    }
+    ...