feat: add 说明书

PetWashControl/ViewModels/MainViewModel.cs

@@ -85,6 +85,9 @@ public partial class MainViewModel : ObservableObject
     [ObservableProperty]
     private string _currentDayOfWeek = DateTime.Now.ToString("dddd", new System.Globalization.CultureInfo("zh-CN"));
 
+    [ObservableProperty]
+    private bool _isInstructionDialogOpen;
+
     private readonly System.Timers.Timer _carouselTimer;
     private readonly System.Timers.Timer _clockTimer;
     private readonly string[] _carouselImages = { "/Images/dog.png", "/Images/dog1.png", "/Images/dog2.png" };
@@ -203,6 +206,20 @@ public partial class MainViewModel : ObservableObject
         _logger.LogInfo($"切换到设置界面，之前的视图: {_previousView}");
     }
 
+    [RelayCommand]
+    private void ShowInstruction()
+    {
+        IsInstructionDialogOpen = true;
+        _logger.LogInfo("显示使用说明");
+    }
+
+    [RelayCommand]
+    private void CloseInstruction()
+    {
+        IsInstructionDialogOpen = false;
+        _logger.LogInfo("关闭使用说明");
+    }
+
     [RelayCommand]
     private void BackToIdle()
     {