cómo instalar la documentación https://www.npmjs.com/package/react-loading-skeleton fluya este documento
yarn add react-loading-skeleton
npm install react-loading-skeleton

 import Skeleton from 'react-loading-skeleton' import 'react-loading-skeleton/dist/skeleton.css' <Skeleton /> // Simple, single-line loading skeleton <Skeleton count={5} /> // Five-line loading skeleton