Add a note that Windows service runs as the LocalSystem account (#1877) (#1880)

Author: renetapopova

modules/ROOT/pages/installation/windows.adoc

@@ -52,6 +52,12 @@ You will then be prompted to change the password.
 
 Neo4j can also be run as a Windows service.
 
+[WARNING]
+====
+By default, the Neo4j Windows service runs as the LocalSystem account, which has full access to the system.
+This is a security risk, and it is recommended to run the service as a user without full LocalSystem privileges.
+====
+
 === Install the Windows service
 
 Install the service with `bin\neo4j windows-service install`, and start it with `bin\neo4j start`.