title: Git: Download zip instead of clone, now cannot commit
body: <p>I accidentally manage to download a repo to a new machine by hitting the "download zip" instead of doing a clone. </p>
  
  <p>I notice after I did a lot of changes, and now I have problems commit and push the new changes to github, since the git repo wasn't included in the zip. </p>
  
  <p>What can I do? </p>
  
  <p>Thanks</p>