Add web installer

Logic is still missing and follows later.

refs #7163

library/Icinga/Application/WebInstaller.php

@@ -0,0 +1,54 @@
+<?php
+// {{{ICINGA_LICENSE_HEADER}}}
+// {{{ICINGA_LICENSE_HEADER}}}
+
+namespace Icinga\Application;
+
+use Icinga\Web\Setup\Installer;
+
+/**
+ * Icinga Web 2 Installer
+ */
+class WebInstaller implements Installer
+{
+    /**
+     * The setup wizard's page data
+     *
+     * @var array
+     */
+    protected $pageData;
+
+    /**
+     * Create a new web installer
+     *
+     * @param   array   $pageData   The setup wizard's page data
+     */
+    public function __construct(array $pageData)
+    {
+        $this->pageData = $pageData;
+    }
+
+    /**
+     * @see Installer::run()
+     */
+    public function run()
+    {
+        return true;
+    }
+
+    /**
+     * @see Installer::getSummary()
+     */
+    public function getSummary()
+    {
+        return array();
+    }
+
+    /**
+     * @see Installer::getReport()
+     */
+    public function getReport()
+    {
+        return array();
+    }
+}