title: Create First Project in QtCreator, problems with kits
body: <p>I've just switched to QtCreator for C and C++ developing. I have problem in creating first project, in particular with compiler kits I suppose.
  When I go to create a new project, I have the error message that no kits is available.
  <img src="https://i.stack.imgur.com/G1HzG.png" alt="No valid kits found">
  <img src="https://i.stack.imgur.com/67rzO.png" alt="Kits">
  <img src="https://i.stack.imgur.com/lLju2.png" alt="Qt Version"></p>
  
  <p>As you can see, I don't know why it is shown that Qt Version is invalid. How could I solve?</p>