add todo for oauth, support multiple api key

samples/client/petstore/php/SwaggerClient-php/lib/Configuration.php

@@ -0,0 +1,36 @@
+<?php
+/**
+ *  Copyright 2015 Reverb Technologies, Inc.
+ *
+ *  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.
+ */
+
+namespace SwaggerClient;
+
+class Configuration {
+
+  public static $PATCH = "PATCH";
+  public static $POST = "POST";
+  public static $GET = "GET";
+  public static $PUT = "PUT";
+  public static $DELETE = "DELETE";
+
+  // authentication setting
+  public static $apiKey = array();
+  public static $apiKeyPrefix = array();
+  public static $username = '';
+  public static $password = '';
+
+
+}
+