added placeholder for timein/timeout input field

parkinglot/app/views/car_logs/new.html.erb

@@ -5,10 +5,10 @@
 		<input type= "text" name= "plate_number"/>
 		<hr>
 		<label>Time In:</label>
-		<input type= "datetime" name= "time_in"/>
+		<input type= "datetime" name= "time_in" placeholder="yyyy-mm-dd 00:00:00" />
 		<hr>
 		<label>Time Out:</label>
-		<input type= "datetime" name= "time_out"/>
+		<input type= "datetime" name= "time_out" placeholder="yyyy-mm-dd 00:00:00"/>
 		<hr>
 		<label>Color:</label>
 		<select name= "color">