Add aka.ms link to log message related to AES-GCM support

Author: GeoK

src/Microsoft.IdentityModel.Tokens/LogMessages.cs

@@ -184,7 +184,7 @@ internal static class LogMessages
         public const string IDX10685 = "IDX10685: Unable to Sign, Internal SignFunction is not available.";
         public const string IDX10686 = "IDX10686: Unable to Verify, Internal VerifyFunction is not available.";
         public const string IDX10687 = "IDX10687: Unable to create a AsymmetricAdapter. For NET45 or NET451 only types: '{0}' or '{1}' are supported. RSA is of type: '{2}'.";
-        public const string IDX10688 = "IDX10688: The algorithm '{0}' is not currently supported. It's possible to provide your own implementation of the algorithm by overriding CryptoProviderFactory and AuthenticatedEncryptionProvider.";
+        public const string IDX10688 = "IDX10688: The algorithm '{0}' is not currently supported. It's possible to provide your own implementation of the algorithm by overriding CryptoProviderFactory and AuthenticatedEncryptionProvider. Example: aka.ms/identitymodel-aesgcm-support";
 
         // security keys
         public const string IDX10700 = "IDX10700: Invalid RsaParameters: '{0}'. Both modulus and exponent should be present";