title: IntelliJ has no 'RUN' option after cloning github repo
body: <p>Cloned Java project from someone else GitHub repo and after opening up a project folder inside InteliJ - it does not show 'RUN' for the main class.</p>
  
  <p>These are options available:<br>
   <a href="https://i.stack.imgur.com/wgxyzm.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/wgxyzm.png" alt="enter image description here"></a></p>
  
  <p>After finding 'main' function in Kotlin - there is still no 'RUN' or green button to run:
  <a href="https://i.stack.imgur.com/RfYSl.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/RfYSl.png" alt="enter image description here"></a><br>
  I noticed that can Mark Directory (for 'src') as 'Resources Root' and that could solve some of the issues but wondering why is this a case and what is the right way to approach to cloned github projects and running them without too much interventions in IntelliJ?</p>