title: How to install or integrate bundles in Symfony2
body: <p>i have downloaded a sonata admin bundle, and have placed in <code>/var/www/Symfony/vendor/symfony/src/Symfony/Bundle</code>, and have made an entry in <code>AppKernel.php</code> as  <code>$bundles = array( ...  new Symfony\Bundle\SonataAdminBundle\SonataAdminBundle(),)</code>, but throwing an error as </p>
  
  <blockquote>
    <p>Fatal error: Class
    'Symfony\Bundle\SonataAdminBundle\SonataAdminBundle' not found in
    /var/www/Symfony/app/AppKernel.php on line 21 Call Stack: 0.0001
    326332 1. {main}() /var/www/Symfony/web/app_dev.php:0 0.0122 1121592
    2. Symfony\Component\HttpKernel\Kernel->handle()</p>
  </blockquote>
  
  <p>please help me as i am very new to symfony 2. As a whole please give a link or detail like how to install/configure any bundle that is downloaded.
  Thanks
  Ravi.M</p>