Add empty subproject/milestone controllers

Summary: Ref T10010. These do nothing yet.

Test Plan: Clicked 'em.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T10010

Differential Revision: https://secure.phabricator.com/D14894

src/applications/project/controller/PhabricatorProjectSubprojectsController.php

@@ -0,0 +1,33 @@
+<?php
+
+final class PhabricatorProjectSubprojectsController
+  extends PhabricatorProjectController {
+
+  public function shouldAllowPublic() {
+    return true;
+  }
+
+  public function handleRequest(AphrontRequest $request) {
+    $viewer = $request->getViewer();
+
+    $response = $this->loadProject();
+    if ($response) {
+      return $response;
+    }
+
+    $project = $this->getProject();
+    $id = $project->getID();
+
+    $nav = $this->buildIconNavView($project);
+    $nav->selectFilter("subprojects/{$id}/");
+
+    $crumbs = $this->buildApplicationCrumbs();
+    $crumbs->addTextCrumb(pht('Subprojects'));
+
+    return $this->newPage()
+      ->setNavigation($nav)
+      ->setCrumbs($crumbs)
+      ->setTitle(array($project->getName(), pht('Subprojects')));
+  }
+
+}