add very basic logback configuration

+<?xml version="1.0" encoding="UTF-8"?>
+<configuration>
+
+  <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+    <layout class="ch.qos.logback.classic.PatternLayout">
+      <Pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</Pattern>
+    </layout>
+  </appender>
+  
+  <logger name="org.legrog" level="DEBUG"/>
+
+  <root level="warn">
+    <appender-ref ref="STDOUT" />
+  </root>
+</configuration>
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