Add Description as well to AuthenticateInfo

(needed by Identity)

src/Microsoft.AspNetCore.Http.Abstractions/Authentication/AuthenticateInfo.cs

@@ -20,5 +20,10 @@ namespace Microsoft.AspNetCore.Http.Authentication
         /// The <see cref="AuthenticationProperties"/>.
         /// </summary>
         public AuthenticationProperties Properties { get; set; }
+
+        /// <summary>
+        /// The <see cref="AuthenticationDescription"/>.
+        /// </summary>
+        public AuthenticationDescription Description { get; set; }
     }
 }

src/Microsoft.AspNetCore.Http/Authentication/DefaultAuthenticationManager.cs

@@ -92,7 +92,8 @@ namespace Microsoft.AspNetCore.Http.Authentication.Internal
             return new AuthenticateInfo
             {
                 Principal = context.Principal,
-                Properties = new AuthenticationProperties(context.Properties)
+                Properties = new AuthenticationProperties(context.Properties),
+                Description = new AuthenticationDescription(context.Description)
             };
         }