title: Adding button in toolbar for intellij plugin
body: <p>I am writing a Plugin for intelliJ IDEA and I have been trying to add a button in the main toolbar, besides the run button:</p>
  
  <p><a href="https://i.stack.imgur.com/bwsWH.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/bwsWH.png" alt="enter image description here"></a></p>
  
  <p>I have been looking for guides to help me do it, but I haven't found any. It has to be possible, this is just my first plugin and I lack the necessary experience. Any help is greatly appreciated. </p>