feat: initial Pyramid project scaffold

lib/core/app.dart

@@ -0,0 +1,29 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_localizations/flutter_localizations.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:pyramid/core/router.dart';
+import 'package:pyramid/core/theme.dart';
+
+class PyramidApp extends ConsumerWidget {
+  const PyramidApp({super.key});
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    final router = ref.watch(routerProvider);
+    final colorScheme = ref.watch(colorSchemeProvider);
+
+    return MaterialApp.router(
+      title: 'Pyramid',
+      theme: buildTheme(colorScheme, Brightness.light),
+      darkTheme: buildTheme(colorScheme, Brightness.dark),
+      themeMode: ThemeMode.system,
+      routerConfig: router,
+      localizationsDelegates: const [
+        GlobalMaterialLocalizations.delegate,
+        GlobalWidgetsLocalizations.delegate,
+        GlobalCupertinoLocalizations.delegate,
+      ],
+      supportedLocales: const [Locale('de'), Locale('en')],
+    );
+  }
+}