title: drag-drop not found in @angular/cdk
body: <p>i am trying to add the drag-drop feature in my Angular 6 application
  where i am trying to use angular material
  <a href="https://material.angular.io/cdk/drag-drop/overview" rel="noreferrer">this is the overview link</a> which i want to use. I followed the <a href="https://material.angular.io/guide/getting-started" rel="noreferrer">getting started</a> instruction's but i am not able to use the "@angular/cdk/drag-drop" 
  i tried installing the bellow package </p>
  
  <blockquote>
    <p>npm install --save @angular/material @angular/cdk @angular/animations </p>
  </blockquote>
  
  <p>and</p>
  
  <blockquote>
    <p>npm install --save @angular/cdk</p>
  </blockquote>
  
  <p>but the bellow folder is still missing 
  <a href="https://i.stack.imgur.com/MnMHw.png" rel="noreferrer"><img src="https://i.stack.imgur.com/MnMHw.png" alt="enter image description here"></a></p>
  
  <blockquote>
    <p>import {DragDropModule} from '@angular/cdk/drag-drop';</p>
  </blockquote>
  
  <p>the drag-drop is not available in my project even after following the steps. can anyone help me with that</p>