first commit

core/Size.h

@@ -0,0 +1,24 @@
+#pragma once
+
+class Size
+{
+    using PointType = long long;
+
+public:
+    Size(
+            PointType width = 0,
+            PointType height = 0
+    );
+
+    PointType width() const;
+    PointType height() const;
+
+    PointType& width();
+    PointType& height();
+
+    PointType area() const;
+
+private:
+    PointType m_Width;
+    PointType m_Height;
+};