added app icon and splash screen for IOS

Author: harmanbatheja15

apps/mobile/ios/mobile/AppDelegate.mm

@@ -10,6 +10,7 @@ - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(
   // You can add your custom initial props in the dictionary below.
   // They will be passed down to the ViewController used by React Native.
   self.initialProps = @{};
+  [NSThread sleepForTimeInterval:2];
 
   return [super application:application didFinishLaunchingWithOptions:launchOptions];
 }