Add License header

Author: nisiyong

apollo-plugin/apollo-log4j2/src/main/java/com/ctrip/framework/apollo/log4j2/ApolloLog4j2ConfigurationFactory.java

@@ -1,3 +1,20 @@
+/*
+ * Copyright 2022 Apollo 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
+ *
+ * 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 com.ctrip.framework.apollo.log4j2;
 
 import com.ctrip.framework.apollo.ConfigFile;