(list)+first test with appends and output

Main now uses append and cout mechanisms for a simple program!

list.cpp

@@ -46,5 +46,9 @@ std::ostream& operator<<(std::ostream& ostream, const List<T> *lst)
 
 int main(void)
 {
+  auto lst = append<int>(NULL, 1);
+  for (int i = 2; i < 10; ++i)
+    lst = append(lst, i);
+  std::cout << lst << std::endl;
   return 0;
 }