adding pods method of package managing

Pods/AppAuth/Source/AppAuthCore/OIDClientMetadataParameters.h

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+/*! @file OIDClientMetadataParameters.h
+    @brief AppAuth iOS SDK
+    @copyright
+        Copyright 2016 The AppAuth for iOS Authors. All Rights Reserved.
+    @copydetails
+        Licensed under the Apache License, Version 2.0 (the "License");
+        you may not use this file except in compliance with the License.
+        You may obtain a copy of the License at
+
+        http://www.apache.org/licenses/LICENSE-2.0
+
+        Unless required by applicable law or agreed to in writing, software
+        distributed under the License is distributed on an "AS IS" BASIS,
+        WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+        See the License for the specific language governing permissions and
+        limitations under the License.
+ */
+
+#import <Foundation/Foundation.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+/*! @brief Parameter name for the token endpoint authentication method.
+ */
+extern NSString *const OIDTokenEndpointAuthenticationMethodParam;
+
+/*! @brief Parameter name for the application type.
+ */
+extern NSString *const OIDApplicationTypeParam;
+
+/*! @brief Parameter name for the redirect URI values.
+ */
+extern NSString *const OIDRedirectURIsParam;
+
+/*! @brief Parameter name for the response type values.
+ */
+extern NSString *const OIDResponseTypesParam;
+
+/*! @brief Parameter name for the grant type values.
+ */
+extern NSString *const OIDGrantTypesParam;
+
+/*! @brief Parameter name for the subject type.
+ */
+extern NSString *const OIDSubjectTypeParam;
+
+/*! @brief Application type that indicates this client is a native (not a web) application.
+ */
+extern NSString *const OIDApplicationTypeNative;
+
+NS_ASSUME_NONNULL_END