Update Magento_AmqpStore ReadMe

Author: diazwatson

app/code/Magento/AmqpStore/README.md

@@ -1,3 +1,9 @@
-# Amqp Store
+# Magento_AmqpStore module
 
-**AmqpStore** provides ability to specify store before publish messages with Amqp.
+Magento_AmqpStore provides ability to specify store before publish messages with with the Advanced Message Queuing Protocol (AMQP).
+
+## Extensibility
+
+Extension developers can interact with the Magento_AmqpStore module using plugins. 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_AmqpStore module.