Update README.md

Author: ismail0234

README.md

@@ -6,8 +6,13 @@ include "benchmark.php";
 
 $performance = new DBPerformance('dbname', 'localhost', 'dbusername', 'dbuserpassword');
 
+// time, 5000 milisecond => 5 second
 $performance->insertBenchmark(5000);
+
+// time, 5000 milisecond => 5 second
 $performance->selectBenchmark(5000);
+
+// time, 5000 milisecond => 5 second
 $performance->updateBenchmark(5000);
 
 $performance->drawBenchmark();