title: Android : not getting GCM Library in extra folder
body: <p>I want to use GCM Service in my application.</p>
  
  <p>From the SDK manager I am not getting GCM Library in the Extras Folder.</p>
  
  <p>Can anyone please help me?</p>
  
  <p><img src="https://i.stack.imgur.com/NeRkz.png" alt="enter image description here"></p>