Add initial module files and templates for Omnibus EU Free

- Created new image file for YouTube logo.
- Added index.php files for views and JavaScript with license notice and redirect to parent directory.
- Implemented back.js for reload functionality with button event listener.
- Introduced configure.tpl template for admin configuration with documentation links and CRON settings.
- Added products-price-list.tpl for displaying product price data in a table format.
- Created index.php files for hook templates with license notice and redirect.
- Added presta_studio_omnibus_price.tpl for displaying product discount information.

modules/omnibuseufree/views/templates/hook/presta_studio_omnibus_price.tpl

@@ -0,0 +1,31 @@
+{*
+*
+* 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
+*
+*}
+
+{if $OmnibuseufreeProductDiscount == true}
+    <div class="presta-studio-price-history">
+        <p class="presta-studio-price-history-text">
+        {if $OmnibuseufreeInfoVersion == 2}
+            {if $OmnibuseufreeProductPriceMin != null}
+                {l s='Lowest price in %d days before discount: ' sprintf=[$OmnibuseufreeNumberOfDays] mod='omnibuseufree'}<span class="presta-studio-price-history-price">{$OmnibuseufreeProductPriceMin}</span>
+            {else}
+                {* when history is empty *}
+                {l s='Lowest price in %d days: ' sprintf=[$OmnibuseufreeNumberOfDays] mod='omnibuseufree'}<span class="presta-studio-price-history-price">{$OmnibuseufreeProductPriceCurrent}</span>
+            {/if}
+        {else}
+            {l s='Lowest price in %d days: ' sprintf=[$OmnibuseufreeNumberOfDays] mod='omnibuseufree'}<span class="presta-studio-price-history-price">{$OmnibuseufreeProductPriceMin}</span>
+        {/if}
+        </p>
+    </div>
+{/if}