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

This is falcon v3.1.2

falcon/templates/checkout/_partials/login-form.tpl

@@ -0,0 +1,48 @@
+{**
+ * 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='customer/_partials/login-form.tpl'}
+
+{block name='form_buttons'}
+  <div class="text-right">
+    <button
+      class="continue btn btn-primary d-none d-md-inline-block"
+      name="continue"
+      data-link-action="sign-in"
+      type="submit"
+      value="1"
+    >
+      {l s='Continue' d='Shop.Theme.Actions'}
+    </button>
+    <button
+      class="continue btn btn-primary btn-block d-block d-md-none"
+      name="continue"
+      data-link-action="sign-in"
+      type="submit"
+      value="1"
+    >
+      {l s='Continue' d='Shop.Theme.Actions'}
+    </button>
+  </div>
+{/block}