title: how to add external package to flutter with visual studio code
body: <p>the doc reference android studio, but I'm using Visual Studio Code, so how do I do this?</p>
  
  <p>"While viewing the pubspec in Android Studio’s editor view, click Packages get upper right."</p>
  
  <p>in pubspec.yaml I added "english_words: ^3.1.0", and I ran 'flutter packages get' from the command palette but it's not working.</p>