game: add fps overlay

game/Player.gd

@@ -12,6 +12,7 @@ var gravity = ProjectSettings.get_setting("physics/3d/default_gravity")
 @onready var head = $Head
 @onready var camera = $Head/PlayerCamera
 @onready var player_debug = $Head/PlayerCamera/PlayerDebug
+@onready var overylay_fps = $Head/PlayerCamera/OverlayFPS
 @onready var player_stats = $PlayerStats
 @onready var anim_player = $AnimationPlayer
 @onready var muzzle_flash = $Head/PlayerCamera/pistol/MuzzleFlash
@@ -39,6 +40,8 @@ func _unhandled_input(event: InputEvent) -> void:
 	if Input.is_action_just_pressed("debug_overlay"):
 		player_debug.visible = !player_debug.visible
 	
+	if Input.is_action_just_pressed("overlay_fps"):
+		overylay_fps.visible = true
 
 func _physics_process(delta: float) -> void:
 	if not is_on_floor():