feat: add example output to folder 01-voucher-design

Author: thaolst

01-voucher-design/README.md

@@ -9,3 +9,45 @@ Nội dung chi tiết + prompt → `SKILL.md`
 ## 01 · Voucher design
 
 Full content + prompt → `SKILL.md`
+
+### 🎯 Ví dụ output
+
+**Đầu vào:** Campaign T12, ngân sách voucher 500 triệu, target 200K redemptions, 2 loại voucher: 50K giảm thẳng (new user) và 20% hoàn xu (existing).
+
+**Kết quả:**
+
+> **Phân bổ budget:**
+> * New user (50K giảm thẳng): 300 triệu, 6K voucher, target 150K redemptions
+> * Existing (20% hoàn xu): 200 triệu, unlimited, target 50K redemptions
+>
+> **Dự kiến ROI:**
+> * New user: 30% redemptions → 45K user mới, CPA ~6.6K
+> * Existing: 25% redemptions → 12.5K user quay lại
+>
+> **Rủi ro cần theo dõi:**
+> * New user: tỷ lệ fraud (multi-account)
+> * Existing: hoàn xu không kịp hết hạn
+
+---
+
+## 01 · Voucher design
+
+Full content + prompt → `SKILL.md`
+
+### 🎯 Example output
+
+**Input:** Campaign T12, voucher budget 500M VND, target 200K redemptions, 2 types: 50K flat discount (new user) and 20% cashback (existing).
+
+**Result:**
+
+> **Budget split:**
+> * New user (50K flat): 300M, 6K vouchers, target 150K redemptions
+> * Existing (20% cashback): 200M, unlimited, target 50K redemptions
+>
+> **Expected ROI:**
+> * New user: 30% redemption → 45K new users, CPA ~6.6K
+> * Existing: 25% redemption → 12.5K returning users
+>
+> **Risks to monitor:**
+> * New user: multi-account fraud
+> * Existing: cashback expiry before use