Rover: Print message when running skid steering SITL

libraries/SITL/SIM_Rover.cpp

@@ -20,6 +20,7 @@
 #include "SIM_Rover.h"
 
 #include <string.h>
+#include <stdio.h>
 
 namespace SITL {
 
@@ -37,6 +38,7 @@ SimRover::SimRover(const char *home_str, const char *frame_str) :
     skid_steering = strstr(frame_str, "skid") != NULL;
 
     if (skid_steering) {
+        printf("SKID Steering Rover Simulation Started\n");
         // these are taken from a 6V wild thumper with skid steering,
         // with a sabertooth controller
         max_accel = 14;