Added AbstractState and StateMachine

game/state_machine/abstract_state.gd

@@ -0,0 +1,24 @@
+class_name AbstractState
+extends Node
+
+
+@warning_ignore("unused_signal")
+signal new_state(state: AbstractState)
+
+
+func enter() -> void:
+	pass
+
+
+func exit() -> void:
+	pass
+
+
+@warning_ignore("unused_parameter")
+func process(delta: float) -> void:
+	pass
+
+
+@warning_ignore("unused_parameter")
+func physics_process(delta: float) -> void:
+	pass