Added basic build menu and placement

scripts/interaction_bar.gd

@@ -0,0 +1,13 @@
+extends ProgressBar
+class_name InteractionBar
+
+signal interaction_finished
+
+func _ready() -> void:
+	var tween = get_tree().create_tween()
+	tween.tween_property(self, "value", 100, 3)
+	tween.tween_callback(_cleanup_gather)
+
+func _cleanup_gather() -> void:
+	interaction_finished.emit()
+	self.queue_free()