Added + icon for File Application

Summary:
I personally upload plenty of files on my own, so I added it to the File application, too

thanks for adding the others btw, I love them

Test Plan: saw it pop up on the home page

Reviewers: chad, epriestley, btrahan, codeblock

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D4583

src/applications/files/application/PhabricatorApplicationFiles.php

@@ -26,6 +26,10 @@ final class PhabricatorApplicationFiles extends PhabricatorApplication {
     return self::GROUP_UTILITIES;
   }
 
+  public function getQuickCreateURI() {
+    return $this->getBaseURI().'upload/';
+  }
+
   public function getRoutes() {
     return array(
       '/F(?P<id>[1-9]\d*)' => 'PhabricatorFileShortcutController',