update build prompt

Author: fadi-george

examples/build.md

@@ -92,6 +92,8 @@ Build the app with:
 - Clean architecture: repository pattern with ChangeNotifier-based state management (Provider)
 - Dart 3+ with null safety
 - Material 3 theming with OneSignal brand colors
+- App name: "OneSignal Demo"
+- Top app bar: centered title with OneSignal logo SVG + "Sample App" text (use centerTitle: true on AppBar)
 - Support for both Android and iOS
 - Android package name: com.onesignal.example
 - iOS bundle identifier: com.onesignal.example