add homepage

lib/base/theme.dart

@@ -0,0 +1,20 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+var themeProvider = ChangeNotifierProvider((ref) => ThemeViewModel());
+
+class ThemeViewModel extends ChangeNotifier {
+  ThemeData currentTheme = lightTheme;
+
+  void changeTheme() {
+    if (currentTheme == darkTheme) {
+      currentTheme = lightTheme;
+    } else {
+      currentTheme = darkTheme;
+    }
+    notifyListeners();
+  }
+}
+
+ThemeData darkTheme = ThemeData.dark().copyWith();
+ThemeData lightTheme = ThemeData.light().copyWith();