Here it is:
When a player spawns initially, he gets a blue tint on his playermodel (or a blue glow)
This glow signifies that the player is protected from all damage (god mode?). Of course, you cam change the blue color to any other color.
He is protected for 5 seconds, but this also can be changed in a config file.
While he is protected, his HUD will display some text to let him know that he is protected.
You can also change the color of that text or enable/disable it.
This is a great idea, i am not sure if any addons like this one exist(I havent seen any).
Also I want ULX support so that you can change these settings from the in game menu, not just from a config file.
What so you think of the idea?