Generate example app icon

Example/ExampleApp/Assets.xcassets/AppIcon.appiconset/Contents.json

 {
   "images" : [
     {
+      "filename" : "iPhone Notification 20pt 2x.png",
       "idiom" : "iphone",
       "scale" : "2x",
       "size" : "20x20"
     },
     {
+      "filename" : "iPhone Notification 20pt 3x.png",
       "idiom" : "iphone",
       "scale" : "3x",
       "size" : "20x20"
     },
     {
+      "filename" : "iPhone Settings 29pt 2x.png",
       "idiom" : "iphone",
       "scale" : "2x",
       "size" : "29x29"
     },
     {
+      "filename" : "iPhone Settings 29pt 3x.png",
       "idiom" : "iphone",
       "scale" : "3x",
       "size" : "29x29"
     },
     {
+      "filename" : "iPhone Spotlight 40pt 2x.png",
       "idiom" : "iphone",
       "scale" : "2x",
       "size" : "40x40"
     },
     {
+      "filename" : "iPhone Spotlight 40pt 3x.png",
       "idiom" : "iphone",
       "scale" : "3x",
       "size" : "40x40"
     },
     {
+      "filename" : "iPhone App 60pt 2x.png",
       "idiom" : "iphone",
       "scale" : "2x",
       "size" : "60x60"
     },
     {
+      "filename" : "iPhone App 60pt 3x.png",
       "idiom" : "iphone",
       "scale" : "3x",
       "size" : "60x60"
     },
     {
+      "filename" : "iPad Notification 20pt 1x.png",
       "idiom" : "ipad",
       "scale" : "1x",
       "size" : "20x20"
     },
     {
+      "filename" : "iPad Notification 20pt 2x.png",
       "idiom" : "ipad",
       "scale" : "2x",
       "size" : "20x20"
     },
     {
+      "filename" : "iPad Settings 29pt 1x.png",
       "idiom" : "ipad",
       "scale" : "1x",
       "size" : "29x29"
     },
     {
+      "filename" : "iPad Settings 29pt 2x.png",
       "idiom" : "ipad",
       "scale" : "2x",
       "size" : "29x29"
     },
     {
+      "filename" : "iPad Spotlight 40pt 1x.png",
       "idiom" : "ipad",
       "scale" : "1x",
       "size" : "40x40"
     },
     {
+      "filename" : "iPad Spotlight 40pt 2x.png",
       "idiom" : "ipad",
       "scale" : "2x",
       "size" : "40x40"
     },
     {
+      "filename" : "iPad App 76pt 1x.png",
       "idiom" : "ipad",
       "scale" : "1x",
       "size" : "76x76"
     },
     {
+      "filename" : "iPad App 76pt 2x.png",
       "idiom" : "ipad",
       "scale" : "2x",
       "size" : "76x76"
     },
     {
+      "filename" : "iPad Pro (12.9-inch) App 83.5pt 2x.png",
       "idiom" : "ipad",
       "scale" : "2x",
       "size" : "83.5x83.5"
     },
     {
+      "filename" : "iOS App Store 1024pt 1x.png",
       "idiom" : "ios-marketing",
       "scale" : "1x",
       "size" : "1024x1024"