add core files

Classes/fft.h

@@ -0,0 +1,27 @@
+//
+// File: fft.h
+//
+// MATLAB Coder version            : 4.3
+// C/C++ source code generated on  : 30-Mar-2020 11:59:32
+//
+#ifndef FFT_H
+#define FFT_H
+
+// Include Files
+#include <cstddef>
+#include <cstdlib>
+#include "rtwtypes.h"
+#include "omp.h"
+#include "cwt_types.h"
+
+// Function Declarations
+extern void fft(const double x_data[], const int x_size[2], creal_T y_data[],
+                int y_size[2]);
+
+#endif
+
+//
+// File trailer for fft.h
+//
+// [EOF]
+//