update plugin install and load strategy

src/ZM/Plugin/Strategy/ComposerStrategy.php

@@ -0,0 +1,15 @@
+<?php
+
+declare(strict_types=1);
+
+namespace ZM\Plugin\Strategy;
+
+class ComposerStrategy extends PluginInstallStrategy
+{
+    public function install(array $option = []): bool
+    {
+        // TODO: Composer 类型的插件还没有实现怎么安装，但很简单。这次 Commit 我偏要鸽！
+        $this->error = 'Not implemented';
+        return false;
+    }
+}