Merged in feature/from-pantheon (pull request #16)

code from pantheon

* code from pantheon

wp/wp-content/plugins/woocommerce/src/Internal/Admin/BlockTemplates/Block.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace Automattic\WooCommerce\Internal\Admin\BlockTemplates;
+
+use Automattic\WooCommerce\Admin\BlockTemplates\BlockContainerInterface;
+use Automattic\WooCommerce\Admin\BlockTemplates\BlockInterface;
+use Automattic\WooCommerce\Admin\BlockTemplates\BlockTemplateInterface;
+
+/**
+ * Generic block with container properties to be used in BlockTemplate.
+ */
+class Block extends AbstractBlock implements BlockContainerInterface {
+	use BlockContainerTrait;
+
+	/**
+	 * Add an inner block to this block.
+	 *
+	 * @param array $block_config The block data.
+	 */
+	public function &add_block( array $block_config ): BlockInterface {
+		$block = new Block( $block_config, $this->get_root_template(), $this );
+		return $this->add_inner_block( $block );
+	}
+}