docs: add nuxi module add instruction

docs/content/1.packages/0.module.md

@@ -28,6 +28,14 @@ Source code on GitHub
 
 ## Quick Setup
 
+```bash
+npx nuxi module add eslint
+```
+
+Then start your Nuxt app, a `eslint.config.mjs` file will be generated under your project root. You can customize it as needed.
+
+### Manual Setup
+
 ::code-group
 ```bash [yarn]
 yarn add --dev @nuxt/eslint eslint
@@ -54,7 +62,7 @@ export default defineNuxtConfig({
 })
 ```
 
-And create an `eslint.config.mjs` file under **your project root**, with the following content:
+And create an `eslint.config.mjs` file under your project root, with the following content:
 
 ```js [eslint.config.mjs]
 import withNuxt from './.nuxt/eslint.config.mjs'