title: "nothing to commit (working directory clean)" when a folder has been added
body: <p>I have a problem in git. I don't know why it says "nothing to commit (working directory clean)."</p>
  
  <p>My development env: CentOS 6.4</p>
  
  <p>My process is below:</p>
  
  <ol>
  <li><code>mkdir develop</code></li>
  <li><code>cd develop</code></li>
  <li><code>git init(set user.name, user.email)</code></li>
  <li><code>git remote add origin "repository_name"</code></li>
  <li><code>git clone "repository_name"</code></li>
  <li><p>Add "Test" folder<br>
  <b>(amon2-setup.pl --flavor=Basic Test)</b></p></li>
  <li><p><code>git status</code> -> at this point, i can see "Untracked files ~~ Test/"</p></li>
  <li><code>cd "Test"</code> folder</li>
  <li><code>git status</code> -> at this point, nothing to commit (working directory clean)</li>
  </ol>
  
  <p>Why does it say this? And if i pushed "Test", my github pushed data has been "subproject," so, i can't see Test folder's contents. Why is that?</p>
  
  <p>Linux(bad)<br>
  <a href="http://www.fastpic.jp/viewer.php?file=6541584337.png" rel="nofollow">http://www.fastpic.jp/viewer.php?file=6541584337.png</a></p>
  
  <p>add amon files from Linux(bad i can't open files)<br>
  <a href="http://www.fastpic.jp/viewer.php?file=4456741517.png" rel="nofollow">http://www.fastpic.jp/viewer.php?file=4456741517.png</a></p>
  
  <p>Windows(ok)<br>
  <a href="http://www.fastpic.jp/images.php?file=8061488422.png" rel="nofollow">http://www.fastpic.jp/images.php?file=8061488422.png</a></p>
  
  <p>add amon files from Windows(ok)<br>
  <a href="http://www.fastpic.jp/viewer.php?file=8164112210.png" rel="nofollow">http://www.fastpic.jp/viewer.php?file=8164112210.png</a></p>