Make Episerver category acessable to editors

CategoryMenuProvider.cs

    [MenuProvider]
    public class MenuProvider : IMenuProvider
    {
        public IEnumerable<MenuItem> GetMenuItems()
        {
            var categoryMenuItem = new UrlMenuItem("Categories", "/global/cms/categories",
                "/EPiServer/CMS/admin/Categories.aspx")
            {
                IsAvailable = (request) => PrincipalInfo.HasEditAccess,
                SortIndex = 100
            };

            return new MenuItem[]
            {
                categoryMenuItem
            };
        }
    }