title: permission denied (publickey) Error using git on windows 7
body: <p>When I want to push to github with this command</p>
  
  <pre><code>git push origin master
  </code></pre>
  
  <p>I got this</p>
  
  <pre><code>Permission denied (publickey).
  fatal: The remote end hung up unexpectedly
  </code></pre>
  
  <p>So, what's wrong?</p>