Add inventory.

src/item/itemtype.h

@@ -0,0 +1,19 @@
+/**
+ * Copyright (c) 2026 Dominic Masters
+ * 
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#pragma once
+#include "dusk.h"
+
+typedef enum {
+  ITEM_TYPE_NULL,
+
+  ITEM_TYPE_MEDICINE,
+  ITEM_TYPE_INGREDIENT,
+  ITEM_TYPE_KEYITEM,
+
+  ITEM_TYPE_COUNT
+} itemtype_t;