title: Why can I not commit? (Your branch is up-to-date with 'origin/master', no changes added to commit)
body: <p>I have been having some trouble committing a file to GitHub. I can make it to git add, but soon as I try <code>$ git commit -m 'my message'</code> I get an error, not allowing me to complete the process of adding a file. </p>
  
  <pre><code>$ git add HelloWorld.md
  
  $ git commit -m 'Hello world'
  </code></pre>
  
  <p>I get the following answer (deleted: <code>README.md</code> &amp; <code>.DS_Store</code> are in red):</p>
  
  <pre><code>On branch master
  
  Your branch is up-to-date with 'origin/master'.
  
  Changes not staged for commit:
          deleted:    README.md
  
  Untracked files:
          .DS_Store
  
  no changes added to commit
  </code></pre>