Moved the credential files into their own folder.

Credentials/CredentialQueryAttrib.cs

@@ -0,0 +1,23 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace NSspi
+{
+    /*
+     #define SECPKG_CRED_ATTR_NAMES        1
+     #define SECPKG_CRED_ATTR_SSI_PROVIDER 2
+     #define SECPKG_CRED_ATTR_KDC_PROXY_SETTINGS 3
+     #define SECPKG_CRED_ATTR_CERT         4
+     */
+
+    public enum CredentialQueryAttrib : uint
+    {
+        Names = 1,
+        SsiProvider = 2,
+        KdcProxySettings = 3,
+        Cert = 4
+    }
+}