✅ asking user where to save file avalonia

// MainWindowViewModel.cs
public void ShareItem()
{
  var vm = new ShareItemViewModel(List.SelectedItem);
}

// ShareItemViewModel.cs
public class ShareItemViewModel : ViewModelBase
{
  public ShareItemViewModel(DiaryModel selectedItem)
  {
  }
}

Date: <- date of entry
Time: <- time of entry
Title: <- title of entry
Entry: <- the entry itself