How to run 'modern usage'?

Can't find out how to run sorting using 'modern usage' from docs

```
import React from 'react';
import { SortableContainer } from 'react-anything-sortable';

class SortableItem extends React.Component {
render() {
return (

);
}
};
```

is there any piece of important information missing? thanks

Review the documentation's “modern usage” guidance alongside the React example in this issue. Clarify the missing steps needed to run sorting, and verify that a newcomer can follow the updated instructions successfully.

Written by the indexing model from the issue text.