how to run a program in cake php

plz help me how to run a simple helloword program in cake php using
xamp

i have created one file in controller with name testers_controller.php

<?php
class TestersController extends Controller{
var $uses=null;
var $autoRender=false;
function sayHello(){
echo 'Hello, CakePHP!';
}
}
?>

but i got 2 errors

like
TestersController could not be found.

Create the class TestersController below in file: app\Controller
\TestersController.php
Notice: If you want to customize this error message, create app\View
\Errors\missing_controller.ctp.

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