Add Dart support

samples/client/petstore/dart/lib/model/user.dart

@@ -0,0 +1,39 @@
+part of api;
+
+
+@Entity()
+class User {
+  
+  int id = null;
+  
+  
+  String username = null;
+  
+  
+  String firstName = null;
+  
+  
+  String lastName = null;
+  
+  
+  String email = null;
+  
+  
+  String password = null;
+  
+  
+  String phone = null;
+  
+  /* User Status */
+  int userStatus = null;
+  
+  
+  User();
+
+  @override
+  String toString()  {
+    return 'User[id=$id, username=$username, firstName=$firstName, lastName=$lastName, email=$email, password=$password, phone=$phone, userStatus=$userStatus, ]';
+  }
+
+}
+