porting shell from nuget to local

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

@@ -0,0 +1,14 @@
+using System;
+
+namespace Standard
+{
+	[Flags]
+	internal enum ErrorModes
+	{
+		Default = 0,
+		FailCriticalErrors = 1,
+		NoGpFaultErrorBox = 2,
+		NoAlignmentFaultExcept = 4,
+		NoOpenFileErrorBox = 32768
+	}
+}