How on Earth do I reference a class library in my ASP.NET Core project?

Hi all,

I'm having trouble getting my head around how project.json works, and the limitations. My setup is:

• Xamarin Client
• Model.dll (.NET 4.5.2)
• ASP Core Web API 

I'd like to reference my Model.dll so that I can use the same classes when sending JSON data between the Xamarin Client and the ASP Core Web API. 

My project.json for reference (with my comments):

{"dependencies": {"Microsoft.NETCore.App": {"version": "1.0.0","type": "platform"
    },"Microsoft.AspNetCore.Mvc": "1.0.0","Microsoft.AspNetCore.Server.IISIntegration": "1.0.0","Microsoft.AspNetCore.Server.Kestrel": "1.0.0","Microsoft.Extensions.Configuration.EnvironmentVariables": "1.0.0","Microsoft.Extensions.Configuration.FileExtensions": "1.0.0","Microsoft.Extensions.Configuration.Json": "1.0.0","Microsoft.Extensions.Logging": "1.0.0","Microsoft.Extensions.Logging.Console": "1.0.0","Microsoft.Extensions.Logging.Debug": "1.0.0","Microsoft.Extensions.Options.ConfigurationExtensions": "1.0.0" <-- Do I reference my Model.dll in this area?
  },"tools": {"Microsoft.AspNetCore.Server.IISIntegration.Tools": "1.0.0-preview2-final"
  },"frameworks": {"netcoreapp1.0": {"imports": ["dotnet5.6","portable-net45+win8" <-- Should I add net462 here?
      ]
    }                         <-- Or do I create a new framework?
  },"buildOptions": {"emitEntryPoint": true,"preserveCompilationContext": true
  },"runtimeOptions": {"configProperties": {"System.GC.Server": true
    }
  },"publishOptions": {"include": ["wwwroot","Views","Areas/**/Views","appsettings.json","web.config","hosting.json"
    ]
  },"scripts": {"postpublish": [ "dotnet publish-iis --publish-folder %publish:OutputPath% --framework %publish:FullTargetFramework%" ]
  }

}

Thank you in advance. If there's any documentation (I can't seem to find any) then I'd love to be pointed in the right direction.

Cheers.