feat: example with multiple various functionallity

examples/multimatrix/MultiMatrixService.h

@@ -18,6 +18,7 @@ public:
 
     bool isReady() const;
     uint8_t getVolume() const;
+    bool isLoopEnabled() const;
 
     void play();
     void stop();
@@ -26,6 +27,7 @@ public:
     void next();
     void previous();
     void setVolume(uint8_t volume);
+    void setLoop(bool enabled);
 
 private:
     static constexpr uint16_t POTENTIOMETER_SAMPLE_INTERVAL_MS = 200;
@@ -47,4 +49,5 @@ private:
     uint8_t m_potentiometerPin;
     uint8_t m_volume;
     bool m_playerReady;
+    bool m_loopEnabled;
 };