adds organs.dm to code/citadel

can probably just move this to the real organs file later, didn't want
to forget about it

code/citadel/organs.dm

@@ -0,0 +1,12 @@
+
+/obj/item/organ/stomach
+	name = "stomach"
+	icon_state = "stomach"
+	zone = "chest"
+	slot = "stomach"
+	w_class = 3
+
+/obj/item/organ/stomach/prepare_eat()
+	var/obj/S = ..()
+	S.reagents.add_reagent("sacid", 2)
+	return S