Add basic template and hooks in Admin

lib/Alchemy/Phrasea/Plugin/PluginMetadataInterface.php

@@ -0,0 +1,28 @@
+<?php
+/*
+ * This file is part of Phraseanet
+ *
+ * (c) 2005-2015 Alchemy
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace Alchemy\Phrasea\Plugin;
+
+interface PluginMetadataInterface
+{
+    /**
+     * @return string
+     */
+    public function getName();
+
+    /**
+     * @return string
+     */
+    public function getVersion();
+
+    /**
+     * @return string
+     */
+    public function getIconUrl();
+}