add explnation for lingering in README

README.md

@@ -5,5 +5,6 @@ docs folder includes some documentation about how to use server. Please read doc
 
 ## Scripts
 
-### adduser-script
-enables lingering after creating a user
+### [adduser-script](/scripts/adduser-space)
+enables lingering after creating a user\
+lingering means user's systemd services are continue work after logout and start with system start

scripts/adduser-space

@@ -2,5 +2,5 @@
 
 username=$1
 useradd -m -s /bin/bash "$username"
-loginctl enable-linger "$username" # for user's systemd services to work after logout and start with system start
+loginctl enable-linger "$username"
 echo "$username"