Add intro to any Chrome app API that has nothing in place already.

chrome/common/extensions/docs/templates/intros/fileSystem.html

Index: chrome/common/extensions/docs/templates/intros/fileSystem.html
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+<p id="classSummary">
+Use the <code>chrome.fileSystem</code> module
+to create, read, navigate, and write
+to a sandboxed section of the user's local file system.
+With this API,
+packaged apps can read and write
+to a user-selected location.
+For example,
+a photo-sharing app can use the API

[miket_OOO, 2012/11/28 19:21:22]

This isn't a fantastic example because we'd want people to consider the
mediaGalleries API instead. How about a text editor, which allows the API to
read and write local documents?

[mkearney1, 2012/11/30 21:42:59]

Done.

+to read and write any photos that a user selects.
+</p>
+
+<h4>Related Documentation</h4>
+<ul>
+	<li><a href="app_storage.html">Manage Data</a></li>
+</ul>