SMS support

[hamzaalnahhas]

srsepc_sms_implementation_prompt.md
i have made a version that supports SMS you can check it here
https://github.com/hamzaalnahhas/srsRAN_4G/tree/sms-support
i fully made this with Claude code so i asked him for a prompt to an AI to do all the changes that we made in case anyone want to do this from the ground-up
first time writing in github