added missing copyright statement.

openid-connect-common/src/main/java/org/mitre/oauth2/model/RegisteredClientFields.java

@@ -1,3 +1,19 @@
+/*******************************************************************************
+ * Copyright 2015 The MITRE Corporation
+ *   and the MIT Kerberos and Internet Trust Consortium
+ *
+ * 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.
+ *******************************************************************************/
 package org.mitre.oauth2.model;
 
 public interface RegisteredClientFields {