/// <summary>
/// Adds an external Url to a Dataset in the City Data Hub
/// </summary>
private static void AddExternalFile()
{
Publisher publisher = GetPublisher();
// get the json to send in the request
string json = System.IO.File.ReadAllText(ConfigurationManager.AppSettings["PathToJsonNewFileRequestBodyExternal"]);
Guid id = publisher.AddExternalFile(json);
Console.WriteLine("Request Identifier is " + id);
}