Add initial module files and templates for Omnibus EU Free

- Created new image file for YouTube logo.
- Added index.php files for views and templates with license notice and redirection.
- Implemented back.js for page reload functionality with a button.
- Developed configure.tpl for admin configuration panel with documentation links.
- Created products-price-list.tpl for displaying product price data in a table format.
- Added presta_studio_omnibus_price.tpl for displaying price history information.
- Established hook templates for integration with PrestaShop.

modules/omnibuseufree/src/compatibility/PrestashopCompatibility.php

@@ -0,0 +1,35 @@
+<?php
+
+/**
+ *
+ * NOTICE OF LICENSE
+ *
+ * This source file is subject to the Apache License, Version 2.0
+ * that is bundled with this package in the file LICENSE.
+ * It is also available through the world-wide-web at this URL:
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  @author    presta.studio
+ *  @copyright Copyright (c) 2023 presta.studio
+ *  @license   http://www.apache.org/licenses/LICENSE-2.0  Apache License, Version 2.0
+ */
+
+declare(strict_types=1);
+
+namespace Omnibus\Compatibility;
+
+use Tools;
+use Context;
+
+class PrestashopCompatibility
+{
+    public static function formatPrice($PSversion, $price, $currency)
+    {
+        if (version_compare($PSversion, '1.7.7') >= 0) {
+            return Tools::getContextLocale(Context::getContext())->formatPrice($price, $currency->iso_code);
+        } 
+        else {
+            return Tools::displayPrice($price, $currency->id);
+        }
+    }
+}