docs: add readme.md to react adapter

Author: TkDodo

packages/react-query/README.md

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+<img src="https://static.scarf.sh/a.png?x-pxid=be2d8a11-9712-4c1d-9963-580b2d4fb133" />
+
+![TanStack Query Header](https://github.com/TanStack/query/raw/beta/media/repo-header.png)
+
+Hooks for fetching, caching and updating asynchronous data in React
+
+<a href="https://twitter.com/intent/tweet?button_hashtag=TanStack" target="\_parent">
+  <img alt="#TanStack" src="https://img.shields.io/twitter/url?color=%2308a0e9&label=%23TanStack&style=social&url=https%3A%2F%2Ftwitter.com%2Fintent%2Ftweet%3Fbutton_hashtag%3DTanStack">
+</a><a href="https://discord.com/invite/WrRKjPJ" target="\_parent">
+  <img alt="" src="https://img.shields.io/badge/Discord-TanStack-%235865F2" />
+</a><a href="https://github.com/TanStack/query/actions?query=workflow%3A%22react-query+tests%22">
+<img src="https://github.com/TanStack/query/workflows/react-query%20tests/badge.svg" />
+</a><a href="https://www.npmjs.com/package/@tanstack/query-core" target="\_parent">
+  <img alt="" src="https://img.shields.io/npm/dm/@tanstack/query-core.svg" />
+</a><a href="https://bundlephobia.com/package/@tanstack/react-query@latest" target="\_parent">
+  <img alt="" src="https://badgen.net/bundlephobia/minzip/@tanstack/react-query" />
+</a><a href="#badge">
+    <img alt="semantic-release" src="https://img.shields.io/badge/%20%20%F0%9F%93%A6%F0%9F%9A%80-semantic--release-e10079.svg">
+  </a><a href="https://github.com/TanStack/query/discussions">
+  <img alt="Join the discussion on Github" src="https://img.shields.io/badge/Github%20Discussions%20%26%20Support-Chat%20now!-blue" />
+</a><a href="https://bestofjs.org/projects/tanstack-query"><img alt="Best of JS" src="https://img.shields.io/endpoint?url=https://bestofjs-serverless.now.sh/api/project-badge?fullName=TanStack%2Fquery%26since=daily" /></a><a href="https://github.com/TanStack/query/" target="\_parent">
+  <img alt="" src="https://img.shields.io/github/stars/TanStack/query.svg?style=social&label=Star" />
+</a><a href="https://twitter.com/tannerlinsley" target="\_parent">
+  <img alt="" src="https://img.shields.io/twitter/follow/tannerlinsley.svg?style=social&label=Follow" />
+</a> <a href="https://gitpod.io/from-referrer/">
+  <img src="https://img.shields.io/badge/Gitpod-Ready--to--Code-blue?logo=gitpod" alt="Gitpod Ready-to-Code"/>
+</a>
+
+Enjoy this library? Try the entire [TanStack](https://tanstack.com)! [TanStack Table](https://github.com/TanStack/table), [TanStack Router](https://github.com/tanstack/router), [TanStack Virtual](https://github.com/tanstack/virtual), [React Charts](https://github.com/TanStack/react-charts), [React Ranger](https://github.com/TanStack/ranger)
+
+## Visit [tanstack.com/query](https://tanstack.com/query) for docs, guides, API and more!
+
+## Quick Features
+
+- Transport/protocol/backend agnostic data fetching (REST, GraphQL, promises, whatever!)
+- Auto Caching + Refetching (stale-while-revalidate, Window Refocus, Polling/Realtime)
+- Parallel + Dependent Queries
+- Mutations + Reactive Query Refetching
+- Multi-layer Cache + Automatic Garbage Collection
+- Paginated + Cursor-based Queries
+- Load-More + Infinite Scroll Queries w/ Scroll Recovery
+- Request Cancellation
+- [React Suspense](https://reactjs.org/docs/concurrent-mode-suspense.html) + Fetch-As-You-Render Query Prefetching
+- Dedicated Devtools
+- <a href="https://bundlephobia.com/package/@tanstack/react-query@latest" target="\_parent">
+  <img alt="" src="https://badgen.net/bundlephobia/minzip/@tanstack/react-query" />
+  </a> (depending on features imported)
+
+### [Become a Sponsor!](https://github.com/sponsors/tannerlinsley/)
+
+<!-- Use the force, Luke -->