Sum of 50 to 100 inclusive is ... and ChangeLog update

src/sum_numbers.cpp

@@ -0,0 +1,16 @@
+#include <iostream>
+
+int main()
+{
+  int sum = 0, value = 50;
+
+  while(value <= 100)
+    {
+      sum += value;
+      ++value;
+    }
+
+  std::cout << "Sum of 50 to 100 inclusive is " << sum << std::endl;
+
+  return 0;
+}