Add organized the vector into header and implementation files

CM2005 Object Oriented Programming/Topic 2/2.6.1/Vec3D.h

@@ -0,0 +1,12 @@
+#pragma once
+
+class Vec3D
+{
+  public:
+    int getLength();
+    int x;
+    int y;
+    int z;
+  private:
+    int size = 3;
+};