feat: webview registration

lib/features/auth/models/credentials_model.dart

@@ -0,0 +1,15 @@
+import 'package:freezed_annotation/freezed_annotation.dart';
+
+part 'credentials_model.freezed.dart';
+
+part 'credentials_model.g.dart';
+
+@freezed
+class CredentialsModel with _$CredentialsModel {
+  const factory CredentialsModel({
+    required String email,
+    required String password,
+  }) = _CredentialsModel;
+
+  factory CredentialsModel.fromJson(Map<String, Object?> json) => _$CredentialsModelFromJson(json);
+}