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.

app.json

@@ -4,7 +4,7 @@
     "slug": "vegas-blackjack",
     "scheme": "blackjack",
     "version": "1.0.0",
-    "orientation": "portrait",
+    "orientation": "default",
     "icon": "./assets/icon.png",
     "splash": {
       "image": "./assets/splash.png",