add license

aws-auth-cognito/src/test/java/com/amplifyframework/auth/cognito/CredentialStoreClientTest.kt

@@ -1,3 +1,18 @@
+/*
+ * Copyright 2023 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License").
+ * You may not use this file except in compliance with the License.
+ * A copy of the License is located at
+ *
+ *  http://aws.amazon.com/apache2.0
+ *
+ * or in the "license" file accompanying this file. This file 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 com.amplifyframework.auth.cognito
 
 import com.amplifyframework.statemachine.codegen.states.CredentialStoreState