Add app icon.

1Weather/Resources/Assets.xcassets/AppIcon.appiconset/Contents.json

 {
   "images" : [
     {
+      "filename" : "Icon-Notification@2x-1.png",
       "idiom" : "iphone",
       "scale" : "2x",
       "size" : "20x20"
     },
     {
+      "filename" : "Icon-Notification@3x.png",
       "idiom" : "iphone",
       "scale" : "3x",
       "size" : "20x20"
     },
     {
+      "filename" : "1w_icon-29@2x.png",
       "idiom" : "iphone",
       "scale" : "2x",
       "size" : "29x29"
     },
     {
+      "filename" : "1w_icon-29@3x.png",
       "idiom" : "iphone",
       "scale" : "3x",
       "size" : "29x29"
     },
     {
+      "filename" : "1w_icon-40@2x-1.png",
       "idiom" : "iphone",
       "scale" : "2x",
       "size" : "40x40"
     },
     {
+      "filename" : "1w_icon-40@3x.png",
       "idiom" : "iphone",
       "scale" : "3x",
       "size" : "40x40"
     },
     {
+      "filename" : "1w_icon-60@2x.png",
       "idiom" : "iphone",
       "scale" : "2x",
       "size" : "60x60"
     },
     {
+      "filename" : "1w_icon-60@3x.png",
       "idiom" : "iphone",
       "scale" : "3x",
       "size" : "60x60"
     },
     {
+      "filename" : "Icon-Notification.png",
       "idiom" : "ipad",
       "scale" : "1x",
       "size" : "20x20"
     },
     {
+      "filename" : "Icon-Notification@2x.png",
       "idiom" : "ipad",
       "scale" : "2x",
       "size" : "20x20"
     },
     {
+      "filename" : "1w_icon-29.png",
       "idiom" : "ipad",
       "scale" : "1x",
       "size" : "29x29"
     },
     {
+      "filename" : "1w_icon-29@2x-1.png",
       "idiom" : "ipad",
       "scale" : "2x",
       "size" : "29x29"
     },
     {
+      "filename" : "1w_icon-40.png",
       "idiom" : "ipad",
       "scale" : "1x",
       "size" : "40x40"
     },
     {
+      "filename" : "1w_icon-40@2x.png",
       "idiom" : "ipad",
       "scale" : "2x",
       "size" : "40x40"
     },
     {
+      "filename" : "1w_icon-76.png",
       "idiom" : "ipad",
       "scale" : "1x",
       "size" : "76x76"
     },
     {
+      "filename" : "1w_icon-76@2x.png",
       "idiom" : "ipad",
       "scale" : "2x",
       "size" : "76x76"
     },
     {
+      "filename" : "1w_icon-167@2x.png",
       "idiom" : "ipad",
       "scale" : "2x",
       "size" : "83.5x83.5"
     },
     {
+      "filename" : "1W-ios_1024.png",
       "idiom" : "ios-marketing",
       "scale" : "1x",
       "size" : "1024x1024"