chore: Add course material

397/SolutionEx41Bonus/Beeper.h

@@ -0,0 +1,25 @@
+// ======================================================
+//
+// Observer to make the crossing beep when traffic
+// lights are red
+//
+// ======================================================
+
+#ifndef BEEPER_H
+#define BEEPER_H
+
+#include "Observer.h"
+
+class Pelican;
+
+class Beeper : public Observer {
+  public:
+    Beeper(Pelican &pel);
+
+    void update();
+
+  private:
+    Pelican &myPelican;
+};
+
+#endif