Added a script to install xl2tp server to ubuntu and configure it automatically

sas4-l2tp-full-installer.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 
 # Update the system
-sudo apt update && sudo apt upgrade -y
+sudo apt update -y
 
 # Install required packages
 sudo apt install strongswan xl2tpd -y