Update AdvancedSearch ReadMe

Author: diazwatson

app/code/Magento/AdvancedSearch/README.md

@@ -1 +1,39 @@
-AdvancedSearch module introduces advanced search functionality and provides interfaces that allow to implement this functionality by 3rd party search engines
+# Magento_AdvancedSearch module
+Magento_AdvancedSearch module introduces advanced search functionality and provides interfaces that allow to implement 
+this functionality by 3rd party search engines.
+
+## Installation details
+
+Before disabling or uninstalling this module, note that the following modules depends on this module:
+- Magento_Elasticsearch
+- Magento_Elasticsearch6
+
+For information about module installation in Magento 2, see [Enable or disable modules](https://devdocs.magento.com/guides/v2.3/install-gde/install/cli/install-cli-subcommands-enable.html).
+
+## Extensibility
+
+Extension developers can interact with the Magento_AdvancedSearch module. For more information about the Magento extension mechanism, see [Magento plug-ins](https://devdocs.magento.com/guides/v2.3/extension-dev-guide/plugins.html).
+
+[The Magento dependency injection mechanism](https://devdocs.magento.com/guides/v2.3/extension-dev-guide/depend-inj.html) enables you to override the functionality of the Magento_AdvancedSearch module.
+
+### Events
+
+This module observes the following event:
+
+ - `catalogsearch_query_save_after` in the `Magento\AdvancedSearch\Model\Recommendations\SaveSearchQueryRelationsObserver` file. 
+
+For information about an event in Magento 2, see [Events and observers](http://devdocs.magento.com/guides/v2.3/extension-dev-guide/events-and-observers.html#events).
+
+### Layouts
+
+The module interact with the following layout handles in the `view/adminhtml/layout` directory:
+
+- `catalog_search_block`
+- `catalog_search_edit`
+- `catalog_search_relatedgrid`
+
+The module interact with the following layout handles in the `view/frontend/layout` directory:
+
+- `catalogsearch_result_index`
+
+For more information about layouts in Magento 2, see the [Layout documentation](https://devdocs.magento.com/guides/v2.3/frontend-dev-guide/layouts/layout-overview.html).