Add LoadGeneralRewardResponse notes

Mapped this out while investigating an issue that turned out to be
unrelated, may as well check in my findings.

src/idz/response/loadGeneralReward.ts

@@ -1,4 +1,12 @@
+export interface LoadGeneralRewardItem {
+  field_04: string; // 40 chars max
+  field_2C: number; // payload?
+  field_38: number; // u8
+  field_39: number; // u8
+  field_3C: number[]; // u32 * 4
+}
+
 export interface LoadGeneralRewardResponse {
   type: "load_general_reward_res";
-  // TODO
+  items: LoadGeneralRewardItem[];
 }