Update Bundle Module README Content

app/code/Magento/Bundle/README.md

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+#Magento_Bundle
+
 Magento_Bundle module introduces new product type in the Magento application named Bundle Product.
 This module is designed to extend existing functionality of Magento_Catalog module by adding new product type.
+
+## Structure
+
+  [Learn about a typical file structure for a Magento 2 module]
+  (https://devdocs.magento.com/guides/v2.4/extension-dev-guide/build/module-file-structure.html).
+
+
+
+## Extensibility
+
+Extension developers can interact with the Magento_Backend module. For more information about the Magento extension mechanism, see [Magento plug-ins](https://devdocs.magento.com/guides/v2.4/extension-dev-guide/plugins.html).
+
+[The Magento dependency injection mechanism](https://devdocs.magento.com/guides/v2.4/extension-dev-guide/depend-inj.html) enables you to override the functionality of the Magento_Backend module.
+
+
+
+### Layouts
+
+  This module introduces the following layouts and layout handles in the directories:
+
+  `view/base/layout`
+    `catalog_product_prices`
+
+  `view/adminhtml/layout`
+     `adminhtml_order_shipment_new`
+     `adminhtml_order_shipment_view`
+     `catalog_product_bundle`
+     `catalog_product_new`
+     `catalog_product_view_type_bundle`
+     `customer_index_wishlist`
+     `sales_order_creditmemo_new`
+     `sales_order_creditmemo_updateqty`
+     `sales_order_creditmemo_view`
+     `sales_order_invoice_new`
+     `sales_order_invoice_updateqty`
+     `sales_order_invoice_view`
+     `sales_order_view`
+
+   `view/frontend/layout` 
+     `catalog_product_view_type_bundle`
+     `catalog_product_view_type_simple`
+     `checkout_cart_configure_type_bundle`
+     `checkout_cart_item_renderers`
+     `checkout_onepage_review_item_renderers`
+     `default`
+     `sales_email_order_creditmemo_renderers`
+     `sales_email_order_invoice_renderers`
+     `sales_email_order_renderers`
+     `sales_email_order_shipment_renderers`
+     `sales_order_creditmemo_renderers`
+     `sales_order_invoice_renderers`
+     `sales_order_item_renderers`
+     `sales_order_print_creditmemo_renderers`
+     `sales_order_print_invoice_renderers`
+     `sales_order_print_renderers`
+     `sales_order_print_shipment_renderers`
+     `sales_order_shipment_renderers`
+
+
+
+### Observer
+    This module observes the following events:
+
+     `etc/events.xml`
+     	`magento_bundle_api_data_optioninterface_save_before` event in `Magento\Framework\EntityManager\Observer\BeforeEntitySave` file.		
+		`magento_bundle_api_data_optioninterface_save_after` event in `Magento\Framework\EntityManager\Observer\AfterEntitySave` file.
+		`magento_bundle_api_data_optioninterface_delete_after` event in `Magento\Framework\EntityManager\Observer\AfterEntityDelete` file.
+	    `magento_bundle_model_selection_save_after` event in `Magento\Framework\EntityManager\Observer\AfterEntitySave` file.
+	    `magento_bundle_model_selection_save_before` event in `Magento\Framework\EntityManager\Observer\BeforeEntitySave` file.
+
+	  `/etc/frontend/events.xml`
+	    `catalog_product_upsell` event in `Magento\Bundle\Observer\AppendUpsellProductsObserver` file.
+	    `product_option_renderer_init` event in `Magento\Bundle\Observer\InitOptionRendererObserver` file.
+
+		`/etc/adminhtml/events.xml`
+			`catalog_product_edit_action` event in `Magento\Bundle\Observer\SetAttributeTabBlockObserver` file.
+		    `catalog_product_new_action` event in `Magento\Bundle\Observer\SetAttributeTabBlockObserver` file.
+