title: How to create collapse menu using Angular Material?
body: <p><a href="https://material.angular.io/components/categories" rel="noreferrer">In documentation of Angular Material</a> there is cool feature. Menu with subcategory which can be expanded/collapsed.</p>
  
  <p>Is it possible to create it using some component? Or I have to do it myself from scratch? Or maybe you can suggest me some package that save my time. </p>
  
  <p><a href="https://i.stack.imgur.com/6QqsE.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/6QqsE.jpg" alt="enter image description here"></a></p>