Add Entropy method

fimdlp/Metrics.h

@@ -0,0 +1,16 @@
+#ifndef METRICS_H
+#define METRICS_H
+#include <vector>
+#include <Python.h>
+#include <utility>
+namespace CPPFImdlp
+{
+    class Metrics
+    {
+    public:
+        Metrics();
+        static float entropy(std::vector<int> &, int, int, int);
+        static int numClasses(std::vector<int> &);
+    };
+}
+#endif