add the USBDevice class and the USBDeviceTest class to tje project

src/main/java/device/UsbPlayer.java

@@ -0,0 +1,49 @@
+package device;
+
+public class UsbPlayer implements Device{
+
+    @Override
+    public void louder() {
+
+    }
+
+    @Override
+    public void quiter() {
+
+    }
+
+    @Override
+    public int getVolume() {
+        return 0;
+    }
+
+    @Override
+    public void next() {
+
+    }
+
+    @Override
+    public void prev() {
+
+    }
+
+    @Override
+    public String getInfoText() {
+        return null;
+    }
+
+    @Override
+    public String[] getOptions() {
+        return new String[0];
+    }
+
+    @Override
+    public void chooseOption(String opt) {
+
+    }
+
+    @Override
+    public String play() {
+        return null;
+    }
+}

src/test/java/device/UsbPlayerTest.java

@@ -0,0 +1,44 @@
+package device;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class UsbPlayerTest {
+
+    @Test
+    void louder() {
+    }
+
+    @Test
+    void quiter() {
+    }
+
+    @Test
+    void getVolume() {
+    }
+
+    @Test
+    void next() {
+    }
+
+    @Test
+    void prev() {
+    }
+
+    @Test
+    void getInfoText() {
+    }
+
+    @Test
+    void getOptions() {
+    }
+
+    @Test
+    void chooseOption() {
+    }
+
+    @Test
+    void play() {
+    }
+}