Launch screen ios assets

ios/CovidShield/Images.xcassets/LaunchScreen.imageset/Contents.json

@@ -1,15 +1,17 @@
 {
  "images" : [
  {
+ "filename" : "launch_screen.png",
  "idiom" : "universal",
  "scale" : "1x"
  },
  {
+ "filename" : "launch_screen@2x.png",
  "idiom" : "universal",
  "scale" : "2x"
  },
  {
- "filename" : "launch_screen.png",
+ "filename" : "launch_screen@3x.png",
  "idiom" : "universal",
  "scale" : "3x"
  }