Add inventory.

archive/rpg/rpg.h

@@ -0,0 +1,32 @@
+/**
+ * Copyright (c) 2025 Dominic Masters
+ * 
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#pragma once
+#include "error/error.h"
+
+typedef struct {
+  int32_t nothing;
+} rpg_t;
+
+/**
+ * Initialize the RPG subsystem.
+ * 
+ * @return An error code and state.
+ */
+errorret_t rpgInit(void);
+
+/**
+ * Update the RPG subsystem.
+ * 
+ * @return An error code.
+ */
+errorret_t rpgUpdate(void);
+
+/**
+ * Dispose of the RPG subsystem.
+ */
+void rpgDispose(void);