AC-7983 update README.md

Author: tranthienbinh1989

Diff for: README.md

@@ -1,2 +1,22 @@
-# composer-dependency-version-audit-plugin
-validating packages through a composer plugin
+# Composer dependency version audit plugin
+
+This composer plugin is used to protect Adobe Commerce merchants from Dependency confusion attacks. It will detect when a public version of a package 
+at packagist.org has a higher version than the one available from a private like repo.magento.com. When you try to install/update packages with composer,
+if it detects a potential issue, the plugin will give you a recommendation message and stop the process.
+
+## Installation
+
+```shell
+composer require magento/composer-dependency-version-audit-plugin
+```
+
+## Usage
+
+When you install/update composer, the composer plugin will stop the process if it detects a potential Dependency Confusion attack. 
+In that case, composer install/update will fail with an error message similar to:
+
+```composer log
+Higher matching version x.x.x of package/name was found in public repository packagist.org than x.x.x in private.repo. 
+Public package might've been taken over by a malicious entity; 
+please investigate and update package requirement to match the version from the private repository.
+```