title: SVN + restricted GIT on only a part of the svn repo
body: <p>I have a large SVN repo<br>
  I'll be outsourcing one folder 'themes' to an external team who can't have access to the complete svn repo.<br>
  I heard 'git svn' would be a way to go ,<br>
  but I'm still quite new to git 
  and don't have a clue on how to proceed.<br>
  if anybody has a clear use case , I'd be gratefull<br>
  Thanks</p>