docs: update

packages/docs/docs/plugin/README.md

@@ -7,4 +7,8 @@ Plugins usually add global-level functionality to VuePress. There is no strictly
 3. Inject global UI. e.g. [@vuepress/plugin-back-to-top](./official/plugin-back-to-top.md);
 4. Extend the CLI with custom commands. e.g. [vuepress-plugin-export](https://github.com/ulivz/vuepress-plugin-export).
 
+Here is also a litte slightly complicated plugin example [@vuepress/plugin-blog](https://vuepress-plugin-blog.ulivz.com). that uses compile-time metadata to generate some dynamic modules and initialize them on the client side by using `enhanceAppFiles`.
+
+The architecture of the whole plugin system is as follows:
+
 ![Architecture of VuePress](/architecture.png)

packages/docs/docs/zh/plugin/README.md

@@ -7,4 +7,8 @@
 3. 注入全局的 UI, 如：[@vuepress/plugin-back-to-top](./official/plugin-back-to-top.md);
 4. 拓展 CLI 的指令，如 [vuepress-plugin-export](https://github.com/ulivz/vuepress-plugin-export)。
 
+这里也有一个略微复杂的插件案例 [@vuepress/plugin-blog](https://vuepress-plugin-blog.ulivz.com), 其使用了编译器的元数据来生成了一些动态模块，并在客户端使用 `enhanceAppFiles` 来初始化他们。
+
+整个插件系统的架构如下:
+
 ![Architecture of VuePress](/architecture.png)