Update README to reflect repository status

Added a notice indicating that the repository is no longer actively maintained and has been archived.

Author: ibakshay

README.md

@@ -1,5 +1,11 @@
 ![build](https://github.com/cla-assistant/github-action/workflows/build/badge.svg)
 
+
+> [!IMPORTANT]
+> **This repository is no longer actively maintained.** I no longer have the bandwidth to maintain this project. The repository has been archived and is now read-only. 
+>
+> You are welcome to **fork this repository** and continue development independently. All existing releases remain functional. Thank you to all contributors and users for your support over the years.
+
 # Handling CLAs and DCOs via GitHub Action
 
 Streamline your workflow and let this GitHub Action (a lite version of [CLA Assistant](https://github.com/cla-assistant/cla-assistant)) handle the legal side of contributions to a repository for you. CLA assistant GitHub action enables contributors to sign CLAs from within a pull request. With this GitHub Action we could get rid of the need for a centrally managed database by **storing the contributor's signature data** in a decentralized way - **in the same repository's file system** or **in a remote repository** which can be even a private repository.