Simple HelloWorld Event for understanding.

src/game/Core/Sound.cpp

@@ -1,9 +1,23 @@
 //
 // Created by Adam on 2015-09-09.
 //
+#include "PrecompiledHeader.h"
 #include "Core/Sound.h"
 
-void dd::Sound::HelloWorld()
+void dd::Systems::Sound::Init()
 {
-    std::cout << "Hej världen!" << std::endl;
+
+}
+
+void dd::Systems::Sound::HelloWorld()
+{
+    LOG_INFO("Hej världen!");
+}
+
+bool dd::Systems::Sound::OnKeyDown(const dd::Events::KeyDown &event)
+{
+    // #define GLFW_KEY_S 83
+    if(event.KeyCode == 83){
+        HelloWorld();
+    }
 }