NLog: Problem using NLog.Config with Xamarin

I am trying to use the NLog.Config with Xamarin.iOS and Xamarin.Android Projects. I downloaded the NLog.Config package from nuget and I added inside the NLog.Config file:

<?xml version="1.0" encoding="utf-8" ?>
<nlog xmlns="http://www.nlog-project.org/schemas/NLog.xsd"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <targets>
        <target name="console" xsi:type="Console" />
    </targets>
    <rules>
        <logger name="*" minlevel="Info" writeTo="console" />
    </rules>
</nlog>

and inside the Main

    static void Main (string[] args)
        {
            Logger logger = LogManager.GetCurrentClassLogger ();
            logger.Trace("Sample trace message");
            logger.Debug("Sample debug message");
            logger.Info("Sample informational message");
            logger.Warn("Sample warning message");
            logger.Error("Sample error message");
            logger.Fatal("Sample fatal error message");
            // if you want to use a different Application Delegate class from "AppDelegate"
            // you can specify it here.
            UIApplication.Main (args, null, "AppDelegate");
        }

But it does not work. It seems that the logger doesn’t load the configuration file. If I set the LoggingConfiguration inside the Main, it works prefectly. What I am missing?