Revert "Remove unused logback-client.xml file (#603)" (#658)

This reverts commit 7463d65.

dist/src/main/distro/conf/logback-client.xml

@@ -0,0 +1,33 @@
+<!--
+
+    Copyright 2019 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
+
+         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.
+
+-->
+
+<!--
+  | mvnd client log configuration
+ -->
+<configuration>
+
+  <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+    <encoder>
+      <pattern>%-5relative %-5level %logger{35} - %msg%n</pattern>
+    </encoder>
+  </appender>
+
+  <root level="${consoleLevel:-info}">
+    <appender-ref ref="STDOUT" />
+  </root>
+</configuration>