docs: add content directory to directory-structure (#5755)

Co-authored-by: Damian <48835293+DamianGlowala@users.noreply.github.com>
Co-authored-by: Pooya Parsa <pooya@pi0.io>

docs/content/2.guide/3.directory-structure/6.content.md

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+---
+icon: IconDirectory
+title: 'content'
+head.title: Content directory
+---
+
+# Content directory
+
+The [Nuxt Content module](https://content.nuxtjs.org) reads the `content/` directory in your project and parses `.md`, `.yml`, `.csv` and `.json` files to create a file-based CMS for your application.
+
+::list{type=success}
+
+- Render your content with built-in components.
+- Query your content with a MongoDB-like API.
+- Use your Vue components in Markdown files with the MDC syntax.
+- Automatically generate your navigation.
+
+::
+
+## Get started
+
+### Installation
+
+Install the `@nuxt/content` module in your project:
+
+::code-group
+
+  ```bash [yarn]
+  yarn add --dev @nuxt/content
+  ```
+
+  ```bash [npm]
+  npm install --save-dev @nuxt/content
+  ```
+
+  ```bash [pnpm]
+  pnpm add -D @nuxt/content
+  ```
+
+::
+
+Then, add `@nuxt/content` to the `modules` section of `nuxt.config.ts`:
+
+```ts [nuxt.config.ts]
+import { defineNuxtConfig } from 'nuxt'
+
+export default defineNuxtConfig({
+  modules: [
+    '@nuxt/content'
+  ],
+  content: {
+    // https://content.nuxtjs.org/api/configuration
+  }
+})
+```
+
+### Create content
+
+Place your markdown files inside the `content/` directory in the root directory of your project:
+
+```md [content/index.md]
+# Hello Content
+```
+
+The module automatically loads and parses them.
+
+### Render pages
+
+To render content pages, add a [catch-all route](/guide/directory-structure/pages/#catch-all-route) using the `ContentDoc` component:
+
+```vue [pages/[...slug].vue]
+<template>
+  <main>
+    <ContentDoc />
+  </main>
+</template>
+```
+
+## Documentation
+
+::alert{type=info}
+Head over to <https://content.nuxtjs.org> to learn more about the Content module features, such as how to build queries and use Vue components in your Markdown files with the MDC syntax.
+::