Real Splash Screen (Not 'Powered by React native' default screen)

[dxn7335]

We currently have an initial loading screen ("powered by Tekken Gamer") but it is preceded by the actual default white splash screen "Powered by React native".

We need to look into adding a real splash screen, with whatever branding we need. If there isn't a "react-native" way to do it yet, we might need to do it separately on xCode and Android Studios. -_-

[scottdj92]

Looks like it doesn't appear on Android, only on iOS. Maybe we only need to set it up for iOS.