Added iOS icons to Xcode project and design files folder

ios/aretherecookies/Images.xcassets/AppIcon.appiconset/Contents.json

@@ -1,34 +1,58 @@
 {
   "images" : [
     {
+      "size" : "20x20",
       "idiom" : "iphone",
+      "filename" : "Icon-App-20x20@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "20x20",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-20x20@3x.png",
+      "scale" : "3x"
+    },
+    {
       "size" : "29x29",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-29x29@2x.png",
       "scale" : "2x"
     },
     {
-      "idiom" : "iphone",
       "size" : "29x29",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-29x29@3x.png",
       "scale" : "3x"
     },
     {
-      "idiom" : "iphone",
       "size" : "40x40",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-40x40@2x.png",
       "scale" : "2x"
     },
     {
-      "idiom" : "iphone",
       "size" : "40x40",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-40x40@3x.png",
       "scale" : "3x"
     },
     {
-      "idiom" : "iphone",
       "size" : "60x60",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-60x60@2x.png",
       "scale" : "2x"
     },
     {
-      "idiom" : "iphone",
       "size" : "60x60",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-60x60@3x.png",
       "scale" : "3x"
+    },
+    {
+      "size" : "1024x1024",
+      "idiom" : "ios-marketing",
+      "filename" : "Icon-App-iTunes.png",
+      "scale" : "1x"
     }
   ],
   "info" : {