add plugin

src/Services/PluginService.php

@@ -0,0 +1,26 @@
+<?php
+/**
+ * Created by PhpStorm.
+ * User: Jaeger <JaegerCode@gmail.com>
+ * Date: 2017/9/22
+ */
+
+namespace QL\Services;
+
+use QL\QueryList;
+
+class PluginService
+{
+    public static function install(QueryList $queryList, $plugins, ...$opt)
+    {
+        if(is_array($plugins))
+        {
+            foreach ($plugins as $plugin) {
+                $plugin::install($queryList);
+            }
+        }else{
+            $plugins::install($queryList,...$opt);
+        }
+        return $queryList;
+    }
+}