Add spine and dialogic museums

addons/dialogic/Example Assets/already_read_indicator.gd

@@ -0,0 +1,12 @@
+extends Control
+
+func _ready() -> void:
+	if DialogicUtil.autoload().has_subsystem('History'):
+		DialogicUtil.autoload().History.visited_event.connect(_on_visited_event)
+		DialogicUtil.autoload().History.unvisited_event.connect(_on_not_read_event)
+
+func _on_visited_event() -> void:
+	show()
+
+func _on_not_read_event() -> void:
+	hide()