Create Examples.md

doc/3. Customization/Examples.md

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+# Examples
+
+- [Classes](#classes)  
+  - [Prices with discounts to icml](#prices-with-discounts-to-icml)
+- [Filters](#filters)  
+
+## Classes
+### Prices with discounts to ICML
+Customization for generate ICML catalog with prices including discounts
+
+Put code to  `.../retailcrm/custom/classes/RetailcrmCatalog.php`:
+```php
+<...>
+$price = !empty($product['rate'])
+? round($product['price'], 2) + (round($product['price'], 2) * $product['rate'] / 100)
+: round($product['price'], 2);
+
+// CUSTOMIZATION
+$id_group = 0; // All groups
+$id_country = 0; // All countries
+$id_currency = 0; // All currencies
+$id_shop = Shop::getContextShopID();
+$specificPrice = SpecificPrice::getSpecificPrice($product['id_product'], $id_shop, $id_currency, $id_country, $id_group, null);
+
+if (isset($specificPrice['reduction'])) {
+    if ($specificPrice['reduction_type'] === 'amount') {
+        $price = round($price - $specificPrice['reduction'], 2);
+    } elseif ($specificPrice['reduction_type'] === 'percentage') {
+        $price = round($price - ($price * $specificPrice['reduction']), 2);
+    }
+}
+// END OF CUSTOMIZATION
+
+if (!empty($product['manufacturer_name'])) {
+    $vendor = $product['manufacturer_name'];
+} else {
+    $vendor = null;
+}
+<...>
+```
+
+## Filters
+### ...
+...
+
+Put code to  `...`:
+```php
+<...>
+code
+<...>
+```