Add MOD enum for keyboard modifier keys

src/ManagedShell.Interop/NativeMethods.User32.cs

@@ -3046,6 +3046,32 @@ public enum KLF : uint
             SETFORPROCESS = 0x00000100
         }
 
+        [Flags]
+        public enum MOD : uint
+        {
+            /// <summary>
+            /// Either ALT key must be held down.
+            /// </summary>
+            ALT = 0x0001,
+            /// <summary>
+            /// Either CTRL key must be held down.
+            /// </summary>
+            CONTROL = 0x0002,
+            /// <summary>
+            /// Changes the hotkey behavior so that the keyboard auto-repeat does not yield multiple hotkey notifications.
+            /// Windows Vista: This flag is not supported.
+            /// </summary>
+            NOREPEAT = 0x4000,
+            /// <summary>
+            /// Either SHIFT key must be held down.
+            /// </summary>
+            SHIFT = 0x0004,
+            /// <summary>
+            /// Either WINDOWS key must be held down. These keys are labeled with the Windows logo. Keyboard shortcuts that involve the WINDOWS key are reserved for use by the operating system.
+            /// </summary>
+            WIN = 0x0008
+        }
+
         public enum VK : int
         {
             ///<summary>