title: Add an unpacked extension from file Selenium node.js
body: <p>I would like to know how i can add an unpacked extension that i have on my computeur to my chrome webdriver using this : 
  <a href="https://seleniumhq.github.io/selenium/docs/api/javascript/module/selenium-webdriver/chrome_exports_Options.html#addExtensions" rel="nofollow noreferrer">https://seleniumhq.github.io/selenium/docs/api/javascript/module/selenium-webdriver/chrome_exports_Options.html#addExtensions</a>
  I don't really understand what im supposed to do with it..
  Thanks in advance to everybody that will help me =)
  P.S : Im using these node packages : selenium-webdriver, fs</p>