chore(docs): add README.md

Author: ndom91

README.md

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+<p align="center">
+   <br/>
+   <a href="https://authjs.dev" target="_blank"><img width="150px" src="https://authjs.dev/img/logo-sm.png" /></a>
+   <h3 align="center">Auth.js 3rd Party Backend</a></h3>
+   <h4 align="center">Authentication for the Web.</h4>
+   <p align="center" style="align: center;">
+      <a href="https://npm.im/next-auth">
+        <img src="https://img.shields.io/badge/TypeScript-blue?style=flat-square" alt="TypeScript" />
+      </a>
+      <a href="https://npm.im/@auth/sveltekit">
+        <img alt="npm" src="https://img.shields.io/npm/v/next-auth?color=green&label=next-auth&style=flat-square">
+      </a>
+      <a href="https://www.npmtrends.com/next-auth">
+        <img src="https://img.shields.io/npm/dm/next-auth?label=%20downloads&style=flat-square" alt="Downloads" />
+      </a>
+      <a href="https://github.com/nextauthjs/next-auth/stargazers">
+        <img src="https://img.shields.io/github/stars/nextauthjs/next-auth?style=flat-square" alt="Github Stars" />
+      </a>
+   </p>
+</p>
+
+This repo contains example code for third party backends to authenticate against.
+
+## Getting Started
+
+The guide for authenticating against third party backends can be found [here](https://authjs.dev/guides/integrating-third-party-backends). 
+
+## Frontend Example
+
+You can find the frontend example of making authenticated requests to these backends in the `next-auth` example app.
+- Code: [`apps/examples/nextjs/app/api/authenticated/greeting/route.tsx`](https://github.com/nextauthjs/next-auth/blob/main/apps/examples/nextjs/app/api/authenticated/greeting/route.tsx)
+- Demo: https://next-auth-example.vercel.app/client-example
+- Example PR: https://github.com/nextauthjs/next-auth/pull/10761/files
+