removed old source code written by C++ Primer Book Authors

io.library.cpp

@@ -1,12 +0,0 @@
-#include <iostream>
-
-int main()
-{
-  std::cout << "Enter two numbers:" << std::endl;
-  int v1 = 0, v2 = 0;
-  std::cin >> v1 >> v2;
-  std::cout << "The sum of " << v1 << " and " << v2
-            << " is " << v1 + v2 << std::endl;
-
-  return 0;
-}