porting shell from nuget to local

src/Shared/Microsoft.Windows.Shell/Standard/MF.cs

@@ -0,0 +1,14 @@
+using System;
+
+namespace Standard
+{
+	[Flags]
+	internal enum MF : uint
+	{
+		DOES_NOT_EXIST = 4294967295u,
+		ENABLED = 0u,
+		BYCOMMAND = 0u,
+		GRAYED = 1u,
+		DISABLED = 2u
+	}
+}