AddOn Request: PvP/Target Finish Him

[Xorious]

Is there a AddOn that says the line "Finish Him" when your targeted enemy, like in PvP, gets to around 15%? The AddOn would proc an audio file for it that the volume could be adjusted for, or tied into the in game voice settings? Maybe also allow it to frame selectable abilities that can execute or something else, and have an adjustable cooldown so it doesn't get spammed to often. Something like that would be cool