Simple state machine so I don't have to write it all over again.
To start clone the repository into your addons folder (or create it in the root of your project if it doesn't exist).
There are two different state machines. The basic StateMachine is for making a state machine that exists entirely in code, which can be useful.
The other is NodeStateMachine, which relies on Godot's node system for handling state.
And you should be ready to go.