public async void OnClicked(object o, EventArgs e)
        {
            var longitude = double.Parse(Lon.Text);
            var latitude  = double.Parse(Lat.Text);


            // var url = string.Format("https://api.geonames.org/findNearByWeatherJSON?formatted=true&lat={0}&lng={1}&username=demo&style=full",latitude,longitude);
            // I'dont have a access to geonames, so I can`t use my Entry values.
            var url = string.Format("http://api.geonames.org/findNearByWeatherJSON?formatted=true&lat=42&lng=-2&username=demo&style=full");

            await vm.GetWeatherAsync(url);
        }