include Yin pitch tracking algo

Source/Yin.h

@@ -0,0 +1,26 @@
+#pragma once
+
+//#include "WProgram.h"
+
+class Yin{
+	
+public: 
+	Yin();
+	Yin(float sampleRate,int bufferSize);
+	void initialize(float sampleRate,int bufferSize);
+	float getPitch(float* buffer);
+	float getProbability();
+	
+private: 
+	float parabolicInterpolation(int tauEstimate);
+	int absoluteThreshold();
+	void cumulativeMeanNormalizedDifference();
+	void difference(float* buffer);
+	
+    double threshold;
+	int bufferSize;
+	int halfBufferSize;
+	float sampleRate;
+	float* yinBuffer;
+	float probability;
+};