added user action

Scripts/build_manager.gd

@@ -14,6 +14,7 @@ signal preview_created
 signal preview_destroyed
 
 signal object_placed(build_postion)
+signal object_added(object)
 
 var build_mode: bool = false
 
@@ -22,6 +23,7 @@ var is_object_selected: bool
 
 var global_y = 2.903
 
+var builded_objects: Array
 
 func _ready() -> void:
 	is_object_selected = false
@@ -52,3 +54,8 @@ func get_preview_object():
 
 func  _on_object_selected():
 	is_object_selected = true
+
+
+func add_object_to_array(object):
+	builded_objects.append(object)
+	object_added.emit(object)