Add base skeleton

moneymgr_mobile/lib/routes/login/login_model.dart

@@ -0,0 +1,16 @@
+import 'package:freezed_annotation/freezed_annotation.dart';
+
+part 'login_model.freezed.dart';
+part 'login_model.g.dart';
+
+@freezed
+abstract class LoginModel with _$LoginModel {
+  const factory LoginModel({
+    // TODO : replace
+    required String username,
+    required String password,
+  }) = _LoginModel;
+
+  factory LoginModel.fromJson(Map<String, dynamic> json) =>
+      _$LoginModelFromJson(json);
+}