Begin adding cost to items

module/data/Item/Ammo.mjs

@@ -26,6 +26,14 @@ export class AmmoData extends CommonItemData {
 				value: this.quantity,
 				min: 0,
 			},
+			{
+				id: `cost`,
+				type: `cost`,
+				label: `RipCrypt.common.cost`,
+				gold: this.cost.gold,
+				silver: this.cost.silver,
+				copper: this.cost.copper,
+			},
 			{
 				id: `access`,
 				type: `dropdown`,

module/data/Item/Common.mjs

@@ -1,5 +1,5 @@
+import { optionalInteger, requiredInteger } from "../helpers.mjs";
 import { gameTerms } from "../../gameTerms.mjs";
-import { requiredInteger } from "../helpers.mjs";
 
 const { fields } = foundry.data;
 
@@ -14,6 +14,11 @@ export class CommonItemData extends foundry.abstract.TypeDataModel {
 				trim: true,
 				choices: gameTerms.Access,
 			}),
+			cost: new fields.SchemaField({
+				gold: optionalInteger(),
+				silver: optionalInteger(),
+				copper: optionalInteger(),
+			}),
 		};
 	};