How-to use SignalR with Xamarin

I have a Xamarin project on my Mac, where I’m trying to get SiganlR to work.

I'm having trouble getting the dll's imported.

I have tried to import the Microsoft.AspNet.SignalR.Client.dll to my Referencer folder in my solution. When I’m adding the dll I get the following message:

Could not get full name for assembly 'mypath/Microsoft.AspNet.SignalR.Client.dll'

And then when I’m trying to build I get another error:

Metadata file `mypath/Microsoft.AspNet.SignalR.Client.dll' does not contain valid metadata.

I'm new in the Xamarin environment, so some help would be appreciated..