Implemented structure for push Notifications

lib/api/mhsl/notify/register/notifyRegisterParams.dart

@@ -0,0 +1,19 @@
+import 'package:json_annotation/json_annotation.dart';
+
+part 'notifyRegisterParams.g.dart';
+
+@JsonSerializable()
+class NotifyRegisterParams {
+  String username;
+  String password;
+  String fcmToken;
+
+  NotifyRegisterParams({
+    required this.username,
+    required this.password,
+    required this.fcmToken
+  });
+
+  factory NotifyRegisterParams.fromJson(Map<String, dynamic> json) => _$NotifyRegisterParamsFromJson(json);
+  Map<String, dynamic> toJson() => _$NotifyRegisterParamsToJson(this);
+}