started research skills

data/buildings/basic/researcher/researcher.gd

@@ -1,5 +1,10 @@
 extends Node
 class_name Researcher
 
-func interact() -> bool:
+const RESEARCH_MENU = preload("res://scene/research_menu.tscn")
+
+func interact(on_interaction_finished: Callable) -> bool:
+	var build_menu = RESEARCH_MENU.instantiate()
+	build_menu.research.connect(on_interaction_finished)
+	add_sibling(build_menu)
 	return true