title: Cannot resolve symbol 'RequestQueue'
body: <p>I am new to android studio and volley library so please bear with me.</p>
  <p>I've added volley library by GitHub and then and added this line to build gradle file:</p>
  <pre><code>compile 'com.android.support:appcompat-v7:23.0.1'
  </code></pre>
  <p>And now I am trying some tutorials about request and response from api, but for some reason I cannot make an instance of <code>RequestQueue</code> why?
  I am using Android 4.0.3 IceCreamSandwish</p>
  <p>Thank you</p>