Adding AL2 copyright header to Java and XML files with Jochen's copyright

src/test/resources/migration/reference/ZUGFeRD2-invoice.xml

@@ -1,4 +1,20 @@
 <?xml version="1.0" encoding="UTF-8"?>
+<!--
+ Copyright 2018 Jochen Staerk
+ 
+  Use is subject to license terms.
+ 
+  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.
+  -->
 <rsm:CrossIndustryInvoice xmlns:rsm="urn:un:unece:uncefact:data:standard:CrossIndustryInvoice:100"
                           xmlns:ram="urn:un:unece:uncefact:data:standard:ReusableAggregateBusinessInformationEntity:100"
                           xmlns:qdt="urn:un:unece:uncefact:data:Standard:QualifiedDataType:100"