How Do I Create Cart Class Using Codeigniter?

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PHP

CodeIgniter

i have download the codeigniter file from the web and i extracted the file inside wamp server. i renamed it as Shoppingme.

and i went inside application config file
and change the code?

$config['base_url']	= "http://localhost/Shoppingme/";

$config['index_page'] = "";

and i change the autoload.php inside application folder as well.

$autoload['libraries'] = array('database','cart');

$autoload['helper'] = array('form','html','url');

didn't create the database yet?.......

and i developed a php file called 'shopMe' inside controller folder.

<?php
class shopMe extends Controller {
    
    function add() {
        $data = array('id'=>'42', 'name'=>'Pants','qty'=>1,'price'=>19.99,
        'options'=>array('Size'=>'medium'));
        
        $this->cart->insert($data);
        echo "add() called";
    }
}
?>

i save the code
and i typed http://localhost/Shoppingme/shopMe/add inside browser and
it gives me this error

Not Found

The requested URL /Shoppingme/shopMe/add was not found on this server.

but answer should be showed in the browser like
add() called..

what i can do for this?