Add ExternalTaskManager class

app/ServiceProvider/ExternalTaskProvider.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace Kanboard\ServiceProvider;
+
+use Kanboard\Core\ExternalTask\ExternalTaskManager;
+use Pimple\Container;
+use Pimple\ServiceProviderInterface;
+
+/**
+ * Class ExternalTaskProvider
+ *
+ * @package Kanboard\ServiceProvider
+ * @author  Frederic Guillot
+ */
+class ExternalTaskProvider implements ServiceProviderInterface
+{
+    /**
+     * Register providers
+     *
+     * @access public
+     * @param  \Pimple\Container $container
+     * @return \Pimple\Container
+     */
+    public function register(Container $container)
+    {
+        $container['externalTaskManager'] = new ExternalTaskManager();
+        return $container;
+    }
+}