The following is an implementation of the GridResolver. The attribute takes two properties; propertyAlias and framework. Framework is used to determine the grid framework. In this case it is fanoe (based on the v7.2.x+ starter kit.

HomeViewModel.cs

using System.Web.Mvc;
using Our.Umbraco.Ditto.Resolvers.Grid.Attributes;

namespace My.Website.ViewModels {
    public class HomeViewModel {
        [GridResolver(framework: "fanoe")]
        public MvcHtmlString Content { get; set; }
    }
}