More redux work. User creation/retrieve

lib/models/user.dart

@@ -0,0 +1,29 @@
+import 'package:meta/meta.dart';
+import 'package:comunes_flutter/comunes_flutter.dart';
+
+@immutable
+class User {
+  final String userId;
+  final String lang;
+  final String token;
+
+  const User.initial()
+      : this.userId = null,
+        lang = null,
+        token = null;
+
+  User({this.userId, this.lang, this.token});
+
+  User copyWith({String userId, String lang, String token}) {
+    return new User(
+        userId: userId ?? this.userId,
+        token: token ?? this.token,
+        lang: lang ?? this.lang);
+  }
+
+  @override
+  String toString() {
+    return 'User {userId: $userId, lang: $lang, token: ${ellipse(token)}';
+  }
+
+}