introduce simple logger

src/main/java/util/tools/Logger.java

@@ -0,0 +1,27 @@
+package util.tools;
+
+// Maximal professioneller Logger
+public final class Logger {
+
+    private static final boolean enabled = true;
+
+    private Logger() {}
+
+    public static void log(String message) {
+        if (enabled) {
+            System.out.println(message);
+        }
+    }
+
+    public static void logNullable(String message) {
+        if (message != null) {
+            log(message);
+        }
+    }
+
+    public static void logIfTrue(boolean pred, String message) {
+        if (pred) {
+            log(message);
+        }
+    }
+}