AI Players with Photon

Options
I have searched and read and searched some more for about 3 days straight now on how to add AI "Bots" to my FPS game and i cant seem to find anything that works, so i was hoping someone here would know how to or know of a few places i should look that can help.

the main idea is to make an option for AI Players when there is no one online to play with in the "room/lobby" you create and host. Friendly and Enemy or atleast just some Enemies to shoot back at you.

Id be happy just getting a simple AI zombie to work lol.
If anyone can shed some light or add some insight id be greatful, doesnt matter which AI asset is needed because i can happily buy a different one if it will get my game back on track. Thanks for your time