Update README.md

Author: iqbalhasandev

README.md

@@ -20,6 +20,8 @@ Made with ❤️ by [Iqbal Hasan](https://www.iqbalhasan.dev)
 
 Integrate SMS system into your project easily with bulk sms bd's API via this plugin.
 
+# This package is abandoned and no longer maintained. The author suggests using the <a href="https://github.com/nanopkg/laravel-bulk-sms-bd">nanopkg/laravel-bulk-sms-bd</a> package instead.
+
 ## Installation Steps
 
 ### 1. Require the Package