init commit

include/shapes/Rectangle.hpp

@@ -0,0 +1,12 @@
+#include "Shape.hpp"
+
+struct Rectangle : public Shape
+{
+  Rectangle(const double sideLen);
+
+  double area() override;
+
+private:
+  double sideLen{};
+};
+

include/shapes/Shape.hpp

@@ -0,0 +1,15 @@
+#include <cstdint>
+#include <iostream>
+
+struct Shape
+{
+  virtual double area() = 0;
+
+  double getArea();
+
+protected:
+  Shape() = delete;
+  Shape(const size_t numSides);
+
+  size_t numSides{};
+};

include/shapes/Triangle.hpp

@@ -0,0 +1,11 @@
+#include "Shape.hpp"
+
+struct Triangle : public Shape
+{
+  Triangle(const double sideLen);
+
+  double area() override;
+
+private:
+  double sideLen{};
+};