ResultStatusMap.AddDefaultMap() is missing the mapping for ResultStatus.Created.

I think this is an oversight because ResultStatusMap.AddDefaultMap()'s documentation says it adds default mapping for all known ResultStatus's.

Calling ResultExtensions.ToActionResult<T>(T Result) throws a System.Collections.Generic.KeyNotFoundException with the message:

The given key 'Created' was not present in the dictionary

1. Is there a reason I don't know of for why Created is not in the mapping?
2. Support for the Created HttpStatusCode should be added, or at least handle it and not throw an exception

If there is agreement on bullet point 2, I am open to working on it.