Resigning immediately after joining project

Depends on the Project. They will throw a tantrum and even say its not possible to put your Resignation and so many other blatant lies.

Drop in your email for Resignation cc manager, his boss, HR, and RMG. Smooth sailing post that. They may even release and reduce your NP. That's totally on them.

But very good call you are leaving the titanic before it strikes the ice berg.

Resign immediately