Update directory layout

Library/IWindowSource.cs

@@ -0,0 +1,17 @@
+using System.Drawing;
+
+namespace FloatingStatusWindowLibrary
+{
+    public interface IWindowSource
+    {
+        string Name { get; }
+        string WindowSettings { get; set; }
+        Icon Icon { get; }
+
+        bool HasSettingsMenu { get; }
+        bool HasRefreshMenu { get; }
+
+        void ShowSettings();
+        void Refresh();
+    }
+}