public override Guid AddList(string title, string description, int templateId)
{
ListCreationInformation createInfo=new ListCreationInformation();
createInfo.Description = description;
createInfo.Title = title;
createInfo.TemplateType = templateId;
var list=_web.Lists.Add(createInfo);
_context.Load(list);
_context.ExecuteQuery();
return list.Id;
}