Adjust project structure

src/Shared/HandyControl_Shared/Controls/Base/ISelectable.cs

@@ -0,0 +1,11 @@
+using System.Windows;
+
+namespace HandyControl.Controls
+{
+    public interface ISelectable
+    {
+        event RoutedEventHandler Selected;
+
+        bool IsSelected { get; set; }
+    }
+}