### Declare Responsive Layout App Dependency in manifest.json

Source: https://github.com/vtex-apps/responsive-layout/blob/master/docs/README.md

This JSON snippet illustrates how to add the `vtex.responsive-layout` app as a dependency in your VTEX theme's `manifest.json` file. Declaring this dependency, typically with a version range like '0.x', makes the app's blocks available for use throughout your theme's configuration.

```json
  "dependencies": {
    "vtex.responsive-layout": "0.x"
  }
```

--------------------------------

### Configure Responsive Layout Blocks in VTEX Theme

Source: https://github.com/vtex-apps/responsive-layout/blob/master/docs/README.md

This comprehensive JSON configuration demonstrates how to integrate `responsive-layout` blocks into a VTEX theme. It defines a `store.custom` block that utilizes `responsive-layout.desktop`, `responsive-layout.tablet`, and `responsive-layout.phone` to display distinct `rich-text` content based on the detected screen size. Each `responsive-layout` block expects an array of `children` blocks, which will be rendered only when the current screen-size matches its specified breakpoint.

```json
  "store.custom#about-us": {
    "blocks": [
      "responsive-layout.desktop",
      "responsive-layout.tablet",
      "responsive-layout.phone"
    ]
  },

  "responsive-layout.desktop": {
    "children": ["rich-text#desktop"]
  },
  "responsive-layout.tablet": {
    "children": ["rich-text#tablet"]
  },
  "responsive-layout.phone": {
    "children": ["rich-text#phone"]
  },

  "rich-text#desktop": {
    "props": {
      "text": "# This will only show up on desktop.",
      "blockClass": "title"
    }
  },
  "rich-text#tablet": {
    "props": {
      "text": "# This will only show up on tablet.",
      "blockClass": "title"
    }
  },
  "rich-text#phone": {
    "props": {
      "text": "# This will only show up on phone.",
      "blockClass": "title"
    }
  }
```

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