Initial setup

mods/shop_items.json

@@ -0,0 +1,18 @@
+{
+  "categories": [
+    {
+      "id": 1,
+      "name": "Items",
+      "description": "Available in-game items for purchase.",
+      "items": [
+        {
+          "id": 1,
+          "name": "Sleep Powder",
+          "description": "Grants 1 hour of sleep bonus.",
+          "ironPrice": 50000,
+          "image": "https://www.wurmpedia.com/images/5/5e/Sleep_powder.png"
+        }
+      ]
+    }
+  ]
+}