added simple wave classes

To assist the input/output of PCM data, we use the fairly straight-forward
WAVE format. These classes simplify the input and output of such data.

app/render/backend/audio/audioworker.cpp

@@ -0,0 +1,6 @@
+#include "audioworker.h"
+
+AudioWorker::AudioWorker()
+{
+
+}

app/render/backend/audio/audioworker.h

@@ -0,0 +1,11 @@
+#ifndef AUDIOWORKER_H
+#define AUDIOWORKER_H
+
+
+class AudioWorker
+{
+public:
+  AudioWorker();
+};
+
+#endif // AUDIOWORKER_H