title: Unresolved reference issue in PyCharm
body: <p>I have a directory structure</p>
  
  <pre><code>├── simulate.py
  ├── src
  │   ├── networkAlgorithm.py
  │   ├── ...
  </code></pre>
  
  <p>And I can access the network module with <code>sys.path.insert()</code>.    </p>
  
  <pre><code>import sys
  import os.path
  sys.path.insert(0, "./src")
  from networkAlgorithm import *
  </code></pre>
  
  <p>However, pycharm complains that it cannot access the module. How can I teach pycham to resolve the reference?</p>
  
  <p><img src="https://i.stack.imgur.com/VwqcZ.png" alt="enter image description here"></p>