docs: Add Ask DeepWiki badge to README (#730)

Co-authored-by: Ankush kumar <31571486+aks96@users.noreply.github.com>

Author: arpit-jn

README.md

@@ -2,6 +2,7 @@
 
 ![Release](https://img.shields.io/npm/v/express-openid-connect)
 [![Codecov](https://img.shields.io/codecov/c/github/auth0/express-openid-connect)](https://codecov.io/gh/auth0/express-openid-connect)
+[![Ask DeepWiki](https://deepwiki.com/badge.svg)](https://deepwiki.com/auth0/express-openid-connect)
 ![Downloads](https://img.shields.io/npm/dw/express-openid-connect)
 [![License](https://img.shields.io/:license-mit-blue.svg?style=flat)](https://opensource.org/licenses/MIT)
 ![CircleCI](https://img.shields.io/circleci/build/github/auth0/express-openid-connect)
@@ -146,4 +147,4 @@ Please do not report security vulnerabilities on the public GitHub issue tracker
 </p>
 <p align="center">
   This project is licensed under the MIT license. See the <a href="https://github.com/auth0/express-openid-connect/blob/master/LICENSE"> LICENSE</a> file for more info.
-</p>
+</p>