Add cout << "START main()"

Author: rwgk

caster_odr_specs_odr_guard/vehicle_specs.cc

@@ -4,6 +4,7 @@ int car_power();
 int truck_power();
 
 int main() {
+  std::cout << "START main()" << std::endl;
   int pwr = 0;
   pwr = car_power();
   std::cout << "car   power: " << pwr << std::endl;