added Logger Manager

src/main/java/fr/packageviewer/LoggerManager.java

@@ -0,0 +1,23 @@
+package fr.packageviewer;
+
+import java.util.logging.*;
+
+public class LoggerManager {
+
+	private static final Level DEFAULT_LOG_LEVEL = Level.INFO;
+
+	public static Logger getLogger(String name){
+		return getLogger(name, DEFAULT_LOG_LEVEL);
+	}
+
+	public static Logger getLogger(String name, Level level){
+		Logger logger = Logger.getLogger(name);
+		logger.setLevel(level);
+
+		Handler handler = new StreamHandler(System.err, new SimpleFormatter());
+		logger.addHandler(handler);
+
+		logger.setUseParentHandlers(false);
+		return logger;
+	}
+}