add correct code

[app.GameProjectTest] / GameProjectTest / Assets.xcassets / Image.imageset / Contents.json

{
  "images" : [
    {
      "filename" : "iterations.png",
      "idiom" : "universal",
      "scale" : "1x"
    },
    {
      "idiom" : "universal",
      "scale" : "2x"
    },
    {
      "idiom" : "universal",
      "scale" : "3x"
    }
  ],
  "info" : {
    "author" : "xcode",
    "version" : 1
  }
}