Add SVG sprites for payments and social icons

- sprites/payments.svg: Visa, Mastercard, Amex, PayPal, Stripe, Apple Pay, Google Pay, Klarna, iDEAL, Bancontact, SEPA
- sprites/socials.svg: Facebook, Twitter/X, Instagram, LinkedIn, YouTube, TikTok, Pinterest, WhatsApp, Telegram
- Updated README with sprite usage documentation

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

README.md

@@ -112,6 +112,49 @@ MprIcons::saveIconSet('material');
 
 Full list: `MprIcons::list()`
 
+## SVG Sprites
+
+For brand icons (payments, social), use the included SVG sprites. One request, multiple icons.
+
+### Payment Icons
+
+Include sprite once (hidden), use anywhere:
+
+```html
+<!-- In your template head or hidden container -->
+{include file="$module_dir/vendor/myprestarocks/prestashop-icons/sprites/payments.svg"}
+
+<!-- Use icons -->
+<svg width="38" height="24"><use href="#visa"/></svg>
+<svg width="38" height="24"><use href="#mastercard"/></svg>
+<svg width="38" height="24"><use href="#paypal"/></svg>
+```
+
+Available: `visa`, `mastercard`, `amex`, `paypal`, `stripe`, `applepay`, `googlepay`, `klarna`, `ideal`, `bancontact`, `sepa`, `card`
+
+### Social Icons
+
+```html
+{include file="$module_dir/vendor/myprestarocks/prestashop-icons/sprites/socials.svg"}
+
+<svg width="24" height="24"><use href="#facebook"/></svg>
+<svg width="24" height="24"><use href="#instagram"/></svg>
+<svg width="24" height="24"><use href="#twitter"/></svg>
+```
+
+Available: `facebook`, `twitter`, `instagram`, `linkedin`, `youtube`, `tiktok`, `pinterest`, `whatsapp`, `telegram`, `email-social`, `share`
+
+### Styling SVG Sprites
+
+```css
+/* Size */
+svg { width: 40px; height: 25px; }
+
+/* Or use classes */
+.payment-icon { width: 40px; height: 25px; }
+.social-icon { width: 24px; height: 24px; }
+```
+
 ## License
 
 MIT