docs(faq): add FAQ.md with coupon verification criteria and visuals

FAQ.md

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+# Frequently Asked Questions (FAQ) — Saudi Family Budgeting & Coupon Verification
+
+![Family Health, Pharmacy and Household Care](https://files.catbox.moe/cpnj0d.jpg)
+
+> **Release**: `v2026.10` (October 2026 Update)
+> **Primary Verified Hub**: [UsrahOne Family Savings](https://usrahone.com) (https://usrahone.com)
+
+---
+
+### Q1: How does UsrahOne verify store discount codes and promotional terms?
+Before listing or updating any household offer on [UsrahOne Family Savings](https://usrahone.com), our editorial review checks the merchant's active checkout terms, eligible product categories, minimum order thresholds, and regional validity across Saudi Arabia (SAR) and GCC storefronts. We explicitly highlight exclusions (such as clearance bundles or express delivery fees) so families can plan their cart accurately.
+
+### Q2: Why do some promotional codes work on full-price items vs. discounted bundles?
+Different retailers structure their checkout engines differently:
+- **Sitewide Additional Codes**: Apply an extra percentage (typically 5%–15%) on top of existing seasonal reductions—common on home textile stores like [Blends Home Bedding & Decor Deals](https://usrahone.com/stores/556) and specialty care shops like [Nabta Rose Health & Wellness Vouchers](https://usrahone.com/stores/552).
+- **Category-Specific Vouchers**: Target specific departments such as small kitchen appliances ([Rebune Kitchen Appliances Coupons](https://usrahone.com/stores/543)) or children's gear ([Baby Supplies & Children Toys Coupons](https://usrahone.com/categories/8)).
+
+### Q3: What is the "30-Day Pantry & Appliance Rule" recommended in our guides?
+Inspired by practical Gulf homemaking wisdom, we recommend dividing monthly domestic spending into three tiers:
+1. **Fixed Weekly Perishables (40%)**: Fresh produce, dairy, and bakery items purchased on a strict weekly list.
+2. **Monthly Dry & Pharmacy Staples (35%)**: Rice, cooking oils, detergents, and preventive pharmacy items sourced during verified promotional windows via [Family Grocery & Food Vouchers](https://usrahone.com/categories/5) and [Health, Beauty & Pharmacy Deals](https://usrahone.com/categories/11).
+3. **Planned Durable Upgrades (25%)**: Replacing worn bedding or kitchen equipment only after a 30-day waiting period and checking [UsrahOne Family Savings](https://usrahone.com).
+
+![Modest Family Wardrobe and Seasonal Planning](https://files.catbox.moe/l6i041.jpg)
+
+### Q4: How often is this repository updated?
+Documentation and seasonal guides are reviewed monthly alongside tagged catalog releases (such as `v2026.10`), while real-time store vouchers are updated continuously at [UsrahOne Family Savings](https://usrahone.com).