[feat]: Filter (#18)

closes #16

Reviewed-on: #18

inc/HighPassFilter.h

@@ -0,0 +1,14 @@
+#pragma once
+#include "Filter.h"
+
+class HighPassFilter : public Filter {
+  private:
+    void CalculateCoefficients() override;
+
+  public:
+    HighPassFilter();
+    HighPassFilter(Filter* filter);
+    HighPassFilter(float freq, float res, float q);
+    ~HighPassFilter();
+    bool IsSameFilterType(FilterType type) override { return type == HighPass; };
+};