title: How can you make a Git directory or file read only?
body: <p>I want to add my Photoshop documents (PSDs) to the repo. However, I want to be the only person who can edit/push the files and all others can read. The reason is that the developers know enough Photoshop to use the documents to get values (font size, colors, etc...) but I don't want them to accidentally edit a file and commit it.</p>
  
  <p>Or maybe there is another way all together?</p>