Update README.md

packages/growi-plugin-pukiwiki-like-linker/README.md

@@ -44,4 +44,12 @@ Install
     $ npm run install-plugin https://github.com/yuki-takei/crowi-plugin-pukiwiki-like-linker.git
     ```
 
-2. build plugin (see official documents)
+1. modify `${CROWI_INSTALLED_DIR}/plugin/plugin.js`
+
+   ```
+   const plugins = [
+     // require('crowi-plugin-pukiwiki-like-linker')
+   ]
+   ```
+
+1. build plugin (see official documents)