title: Qt Creator adding mqtt library
body: <p>Working on Win 10 with QT Creator 4.3.1
  Trying to add a library to my qt project via the GUI. In specific the qtmqtt library.</p>
  
  <p>right click on project -> "Add library..." and simply nothing happens.</p>
  
  <p>Anybody else having this problem?</p>
  
  <p>Seems like I am to stupid to add a library directory via the .pro file. Googled for hours but cant get my head around it. So I really need the GUI solution to be working. </p>