Added content on the Admin Area's `Projects` page

Part of issue 57874

doc/user/admin_area/index.md

@@ -16,7 +16,7 @@ The Admin Area is made up of the following sections:
 
 | Section           | Description                                                                                                                                              |
 |:------------------|:---------------------------------------------------------------------------------------------------------------------------------------------------------|
-| Overview          | View your GitLab [Dashboard](#admin-dashboard), and maintain projects, users, groups, jobs, runners, and Gitaly servers.                                                     |
+| Overview          | View your GitLab [Dashboard](#admin-dashboard), and administer [projects](#administer-projects), users, groups, jobs, runners, and Gitaly servers. |
 | Monitoring        | View GitLab system information, and information on background jobs, logs, [health checks](monitoring/health_check.md), request profiles, and audit logs. |
 | Messages          | Send and manage [broadcast messages](broadcast_messages.md) for your users.                                                                              |
 | System Hooks      | Configure [system hooks](../../system_hooks/system_hooks.md) for many events.                                                                            |
@@ -47,3 +47,27 @@ The Dashboard is the default view of the Admin Area, and is made up of the follo
 | Statistics | Totals of all elements of the GitLab instance. |
 | Features   | All features available on the GitLab instance. Enabled features are marked with a green circle icon, and disabled features are marked with a power icon. |
 | Components | The major components of GitLab and the version number of each. A link to the Gitaly Servers is also included. |
+
+## Administer Projects
+
+You can administer all projects in the GitLab instance from the Admin Area's Projects page.
+
+To access the Projects page, go to **Admin Area > Overview > Projects**.
+
+Click the **All**, **Private**, **Internal**, or **Public** tab to list only projects of that
+criteria.
+
+By default, all projects are listed, in reverse order of when they were last updated. For each
+project, the name, namespace, description, and size is listed, also options to **Edit** or
+**Delete** it.
+
+Sort projects by **Name**, **Last created**, **Oldest created**, **Last updated**, **Oldest
+updated**, **Owner**, and choose to hide or show archived projects.
+
+In the **Filter by name** field, type the project name you want to find, and GitLab will filter
+them as you type.
+
+Select from the **Namespace** dropdown to filter only projects in that namespace.
+
+You can combine the filter options. For example, click the **Public** tab, and enter `score` in
+the **Filter by name...** input box to list only public projects with `score` in their name.
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