add PropertyGrid v1

src/Shared/HandyControl_Shared/Controls/PropertyGrid/PropertyItem.cs

@@ -1,4 +1,5 @@
 using System;
+using System.ComponentModel;
 using System.Windows;
 using System.Windows.Controls;
 
@@ -123,6 +124,8 @@ namespace HandyControl.Controls
             set => SetValue(IsExpandedEnabledProperty, value);
         }
 
+        public PropertyDescriptor PropertyDescriptor { get; set; }
+
         public virtual void InitElement()
         {
             if (Editor == null) return;