完成添加变量功能

ViewModels/Dialogs/VarDataDialogViewModel.cs

@@ -0,0 +1,14 @@
+using CommunityToolkit.Mvvm.ComponentModel;
+using PMSWPF.Models;
+
+namespace PMSWPF.ViewModels.Dialogs;
+
+public partial class VarDataDialogViewModel : ObservableObject
+{
+    [ObservableProperty]
+    private VariableData variableData;
+    [ObservableProperty]
+    private string title;
+    [ObservableProperty]
+    private string primaryButtonText;
+}