Add Test-Defender-AndAmsiWorkProperly to SharePointServer.md

Author: garycentric

sharepoint/sharepoint-server-ps/SharePointServer/SharePointServer.md

@@ -2448,6 +2448,9 @@ Replaces existing certificate assignments with a new certificate.
 ### [Sync-SPProjectPermissions](Sync-SPProjectPermissions.md)
 Manually synchronizes permissions between a Project Web App instance and its associated project sites.
 
+### [Test-DefenderAndAmsiWorkProperly](Test-DefenderAndAmsiWorkProperly.md)
+Tests that Windows Defender components and SharePoint AMSI integration are properly installed and running.
+
 ### [Test-SPContentDatabase](Test-SPContentDatabase.md)
 Tests a content database.