title: Should xcworkspace be in gitignore
body: <p>I am using <a href="https://github.com/github/gitignore/blob/master/Objective-C.gitignore" rel="noreferrer">GitHubObjectiveCGitIgnore</a></p>
  
  <p>When I go in sourcetree to commit I see :</p>
  
  <pre><code>project.xcworkspace
  </code></pre>
  
  <p>This file is not ignored using Github .gitignore file.
  I am not sure do I need to commit and push this file?</p>