/// <summary>
/// Get and save settings to file
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private async void SaveSettingsButton_Clicked(object sender, EventArgs e)
{
App.questionOrder = (Constants.QuestionOrder)QuestionOrderPicker.SelectedIndex;
App.termDisplay = (Constants.TermDisplay)TermDisplayPicker.SelectedIndex;
App.provideFeedback = (Constants.ProvideFeedback)ProvideFeedbackPicker.SelectedIndex;
// Returns success or error message
await this.DisplayAlert("Test Mate", AppFunctions.SaveSettingsToFile(App.questionOrder, App.termDisplay, App.provideFeedback), "OK");
await Application.Current.MainPage.Navigation.PopAsync();
}