Its a skin working for all android phones.
The step u need to follow to add it will be as follows:
1. Add a folder named skin in the following loc : android/data/com.guildsoftware.vendetta/files/skin/.
2.Then move the neonblack skin in the skin folder.
3.Now modify the config.ini folder like : it will be written like skin= skin/platinum/. Just cahnge that to skin =skin/NeonBlack/.
4.Now run the game.
If u suffer any problem contact me in discord.