feat(main): Add base theme: This is the falcon theme out of the box.

This is falcon v3.1.2

falcon/templates/checkout/checkout.tpl

@@ -0,0 +1,58 @@
+{**
+ * Copyright since 2007 PrestaShop SA and Contributors
+ * PrestaShop is an International Registered Trademark & Property of PrestaShop SA
+ *
+ * NOTICE OF LICENSE
+ *
+ * This source file is subject to the Academic Free License 3.0 (AFL-3.0)
+ * that is bundled with this package in the file LICENSE.md.
+ * It is also available through the world-wide-web at this URL:
+ * https://opensource.org/licenses/AFL-3.0
+ * If you did not receive a copy of the license and are unable to
+ * obtain it through the world-wide-web, please send an email
+ * to license@prestashop.com so we can send you a copy immediately.
+ *
+ * DISCLAIMER
+ *
+ * Do not edit or add to this file if you wish to upgrade PrestaShop to newer
+ * versions in the future. If you wish to customize PrestaShop for your
+ * needs please refer to https://devdocs.prestashop.com/ for more information.
+ *
+ * @author    PrestaShop SA and Contributors <contact@prestashop.com>
+ * @copyright Since 2007 PrestaShop SA and Contributors
+ * @license   https://opensource.org/licenses/AFL-3.0 Academic Free License 3.0 (AFL-3.0)
+ *}
+
+{extends file=$layout}
+
+{block name='header'}
+  {include file='checkout/_partials/header.tpl'}
+{/block}
+
+{block name='content'}
+  <section id="content">
+    <div class="row">
+      <div class="cart-grid-body col-12 col-lg-8 mb-4">
+        <div class="card">
+          {block name='checkout_process'}
+            {render file='checkout/checkout-process.tpl' ui=$checkout_process}
+          {/block}
+        </div>
+      </div>
+
+      <div class="cart-grid-right col-12 col-lg-4">
+
+        {block name='cart_summary'}
+          {include file='checkout/_partials/cart-summary.tpl' cart=$cart}
+        {/block}
+
+        {hook h='displayReassurance'}
+      </div>
+    </div>
+  </section>
+{/block}
+
+{block name='footer'}
+  {include file='checkout/_partials/footer.tpl'}
+{/block}
+