Add FSharp functional test

See https://github.com/KuduApps/MVCAppWithFSharp/blob/master/README.md

    MVCAppWithFSharp

    Exercise FSharp with MVC app per steps described by cbadke's http://hello-fsharp.azurewebsites.net/.

    Detailed discussion is in https://github.com/projectkudu/kudu/issues/137.