Adjust project structure

src/Shared/HandyControlDemo_Shared/ViewModel/Common/ComboBoxDemoViewModel.cs

@@ -0,0 +1,9 @@
+using HandyControlDemo.Service;
+
+namespace HandyControlDemo.ViewModel
+{
+    public class ComboBoxDemoViewModel : DemoViewModelBase<string>
+    {
+        public ComboBoxDemoViewModel(DataService dataService) => DataList = dataService.GetComboBoxDemoDataList();
+    }
+}