title: Cannot push files to remote repository
body: <p>I cloned an empty <code>repo</code> for a project I'm invited to, but then cannot push files to the remote (first time push).</p>
  
  <pre><code>git remote -v
  origin  https://gitlab.com/project-path (fetch)
  origin  https://gitlab.com/project-path (push)
  </code></pre>
  
  <p>I can confirm I successfully added my <code>ssh</code> public key:</p>
  
  <pre><code>ssh -T git@gitlab.com
  Welcome to GilLab, @username!
  </code></pre>
  
  <p>But unable to push file:</p>
  
  <pre><code>git push README.md
  fatal: invalid gitfile format: README.md
  fatal: Could not read from remote repository.
  
  Please make sure you have the correct access rights
  and the repository exists.
  </code></pre>
  
  <p>What am I missing here?</p>