Louder() in UsbPlayer implemented

src/main/java/device/UsbPlayer.java

@@ -16,7 +16,11 @@ public class UsbPlayer implements Device {
 
     @Override
     public void louder() {
-
+        if(Lautstaerke < 100) {
+            Lautstaerke += 1;
+        } else {
+            Lautstaerke = 100;
+        }
     }
 
     @Override