`<CardGroup />` component example:

```js
import {
  CardGroup,
  Card,
  CardImg,
  CardBlock,
  CardTitle,
  CardSubtitle,
  CardText,
  CardFooter,
  Button,
  Small,
} from '$PACKAGE_NAME';

<CardGroup>
  <Card>
    <CardImg top width="100%" src="https://placeholdit.imgix.net/~text?txtsize=33&txt=256%C3%97180&w=256&h=180" alt="Card image cap" />
    <CardBlock>
      <CardTitle>Card groups</CardTitle>
      <CardSubtitle>is responsive</CardSubtitle>
      <CardText>and help you fast display cards components.</CardText>
      <Button>Try it</Button>
    </CardBlock>
  </Card>
  <Card>
    <CardImg top width="100%" src="https://placeholdit.imgix.net/~text?txtsize=33&txt=256%C3%97180&w=256&h=180" alt="Card image cap" />
    <CardBlock>
      <CardTitle>Card groups</CardTitle>
      <CardText>are customizable and could have any amount of card</CardText>
    </CardBlock>
    <CardFooter>
      <Small className="text-muted">inside it</Small>
    </CardFooter>
  </Card>
</CardGroup>
```