docs: add Angular 19 requirement and security notice

Note that v2.5.0 requires Angular 19.2.17+ and fixes CVE-2025-66035 and CVE-2025-66412

Author: yogeshchoudhary147

README.md

@@ -21,6 +21,10 @@ A library for integrating [Auth0](https://auth0.com) into an Angular application
 
 ## Getting started
 
+### Angular 19 Security Update
+
+**v2.5.0** requires Angular 19.2.17+ and addresses two high-severity vulnerabilities (CVE-2025-66035, CVE-2025-66412). Angular 18 is no longer supported as it has reached end-of-life.
+
 ### Requirements
 
 This project only supports the [actively supported versions of Angular as stated in the Angular documentation](https://angular.dev/reference/releases#actively-supported-versions). Whilst other versions might be compatible they are not actively supported.
@@ -188,4 +192,4 @@ Please do not report security vulnerabilities on the public GitHub issue tracker
 </p>
 <p align="center">Auth0 is an easy to implement, adaptable authentication and authorization platform. To learn more checkout <a href="https://auth0.com/why-auth0">Why Auth0?</a></p>
 <p align="center">
-This project is licensed under the MIT license. See the <a href="https://github.com/auth0/auth0-angular/tree/main/LICENSE"> LICENSE</a> file for more info.</p>
+This project is licensed under the MIT license. See the <a href="https://github.com/auth0/auth0-angular/tree/main/LICENSE"> LICENSE</a> file for more info.</p>