Add initial iOS project structure for Vegas Blackjack

- Created SplashScreenBackground image asset with multiple scales.
- Added image file for SplashScreenBackground.
- Initialized Info.plist with essential app configuration.
- Created SplashScreen storyboard for launch screen design.
- Added Expo.plist for update configurations.
- Created bridging header for Swift compatibility.
- Added entitlements for in-app payments.
- Implemented main entry point for the application.
- Added a placeholder Swift file for native module compatibility.

ios/VegasBlackjack/VegasBlackjack-Bridging-Header.h

@@ -0,0 +1,3 @@
+//
+//  Use this file to import your target's public headers that you would like to expose to Swift.
+//