feat: Add description of the admin feature to the docs

packages/internal/docs/docs/v2/introduction/features/admin.mdx

@@ -2,4 +2,20 @@
 title: Admin panel
 ---
 
-TBD
+The SaaS Boilerplate provides an admin feature that allows developers to manage data and perform administrative tasks
+using the [Django admin site](https://docs.djangoproject.com/en/4.2/ref/contrib/admin/). The admin feature is designed
+to provide a quick, model-centric interface that allows developers to manage data and perform custom admin actions.
+
+### Using the Django Admin Site
+
+The SaaS Boilerplate uses the Django admin site to provide a user-friendly interface for managing data. The Django admin
+site is a powerful tool that allows developers to manage data and perform administrative tasks, such as adding, editing,
+and deleting records. The admin site is built on top of Django's models, which means that it can read metadata from
+models to provide a quick, model-centric interface.
+
+### Access to Custom Admin Actions
+
+The SaaS Boilerplate admin panel provides access to custom admin actions that allow developers to perform specific tasks
+related to their application. For example, it’s possible to export user data using a custom admin action. The custom
+admin action can be added to the admin site using the built-in admin action interface, which makes it easy to add custom
+functionality to the admin site.