add forward declaration

add classes

CPlusPlus/Classes/Entity.cpp

@@ -0,0 +1,12 @@
+#include "Entity.h" // project header files, pre compiler will search in project folder first
+#include <iostream> // system header files, pre compiler will search in system folders first
+
+Entity::Entity() // defined
+{
+
+}
+
+Entity::Entity(std::string name) : _name(name)
+{
+	//_name = name;
+}