ENGCOM-5720: Update Magento_AuthorizenetAcceptjs Readme #24326

Author: sidolov

app/code/Magento/AuthorizenetAcceptjs/README.md

@@ -1 +1,29 @@
+# Magento_AuthorizenetAcceptjs module
+
 The Magento_AuthorizenetAcceptjs module implements the integration with the Authorize.Net payment gateway and makes the latter available as a payment method in Magento.
+
+## Installation details
+
+Before disabling or uninstalling this module, note that the `Magento_AuthorizenetCardinal` module depends on this module.
+
+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).
+
+## Structure
+
+`Gateway/` - the directory that contains payment gateway command interfaces and service classes.
+
+For information about typical file structure of a module in Magento 2, see [Module file structure](http://devdocs.magento.com/guides/v2.3/extension-dev-guide/build/module-file-structure.html#module-file-structure).
+
+## Extensibility
+
+Extension developers can interact with the Magento_AuthorizenetAcceptjs 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_AuthorizenetAcceptjs module.
+
+### Events
+
+This module observes the following events:
+
+- `payment_method_assign_data_authorizenet_acceptjs` event in the `Magento\AuthorizenetAcceptjs\Observer\DataAssignObserver` file.
+
+For information about an event in Magento 2, see [Events and observers](https://devdocs.magento.com/guides/v2.3/extension-dev-guide/events-and-observers.html#events).