Add missing license

Signed-off-by: Stefano Cordio <stefano.cordio@gmail.com>

Author: scordio

spring-batch-infrastructure/src/main/java/org/springframework/batch/item/ItemWriter.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.batch.item;
 
 import java.util.function.Function;

spring-batch-infrastructure/src/test/java/org/springframework/batch/item/ItemWriterIntegrationTests.java

@@ -1,3 +1,19 @@
+/*
+ * Copyright 2006-2022 the original author or authors.
+ *
+ * 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
+ *
+ *      https://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.springframework.batch.item;
 
 import org.junit.jupiter.api.Test;