Introduce new constants in OpenIdConnectConstants

Author: kevinchalet

src/AspNet.Security.OpenIdConnect.Primitives/OpenIdConnectConstants.cs

@@ -112,6 +112,7 @@ public static class Errors
             public const string InvalidRequestObject = "invalid_request_object";
             public const string InvalidRequestUri = "invalid_request_uri";
             public const string InvalidScope = "invalid_scope";
+            public const string InvalidToken = "invalid_token";
             public const string LoginRequired = "login_required";
             public const string RegistrationNotSupported = "registration_not_supported";
             public const string RequestNotSupported = "request_not_supported";
@@ -232,6 +233,7 @@ public static class Parameters
             public const string Password = "password";
             public const string PostLogoutRedirectUri = "post_logout_redirect_uri";
             public const string Prompt = "prompt";
+            public const string Realm = "realm";
             public const string RedirectUri = "redirect_uri";
             public const string RefreshToken = "refresh_token";
             public const string Registration = "registration";
@@ -306,6 +308,12 @@ public static class Separators
             public static readonly char[] Space = { ' ' };
         }
 
+        public static class Schemes
+        {
+            public const string Basic = "Basic";
+            public const string Bearer = "Bearer";
+        }
+
         public static class Scopes
         {
             public const string Address = "address";