added missing copyright header for logback-test.xml

Signed-off-by: Thomas Jaeckle <thomas.jaeckle@bosch.io>

edge/service/src/test/resources/logback-test.xml

@@ -1,4 +1,16 @@
 <?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ~ Copyright (c) 2022 Contributors to the Eclipse Foundation
+  ~
+  ~ See the NOTICE file(s) distributed with this work for additional
+  ~ information regarding copyright ownership.
+  ~
+  ~ This program and the accompanying materials are made available under the
+  ~ terms of the Eclipse Public License 2.0 which is available at
+  ~ http://www.eclipse.org/legal/epl-2.0
+  ~
+  ~ SPDX-License-Identifier: EPL-2.0
+  -->
 <configuration>
 
     <contextListener class="ch.qos.logback.classic.jul.LevelChangePropagator">