Agent signatures

Hello.

I'd like to suggest adding a signature to each message. Something like the picture.

Every message sent from botsailor has the signature of the agent or department.

https://ibb.co/PX5WJdv (uploading image doesn't work xd)

This feature has been requested by a client for some time, and I think it could be a feature that would add value to botsailor.

Thank you.