Added (Check Duplicates Before Adding New User)

readme.md

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+`L2tp Manager Allows sas users to manage l2tp accounts using PHP Website`
+
+1- Login Into SSH SAS Terminal
+
+2- Run The Following Script
+
+#Script
+```
+curl -sL https://raw.githubusercontent.com/h4775346/l2tp-manager/master/sas4-install.sh | sudo bash
+```
+## Then You are ready to go
+
+```
+http://______sas_ip______/l2tp-manager/
+```
+
+💥 Make Sure you has installed l2tp server