add login

lib/module/login/login_viewmodel.dart

@@ -0,0 +1,19 @@
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:qinglong_app/base/base_viewmodel.dart';
+
+var loginProvider = ChangeNotifierProvider((ref) => LoginViewModel());
+
+class LoginViewModel extends ViewModel {
+  bool loginSuccess = false;
+  bool isLoading = false;
+
+  void login(String userName, String password) {
+    isLoading = true;
+    notifyListeners();
+    Future.delayed(Duration(seconds: 2), () {
+      isLoading = false;
+      loginSuccess = true;
+      notifyListeners();
+    });
+  }
+}