How to use
curl -L -O https://raw.githubusercontent.com/zackdevine/setup-strongswan-vpn-account/master/setup-vpn-account.sh
sudo chmod +x setup-vpn-account.sh
sudo ./setup-vpn-account.sh
This script will automatically backup /etc/ipsec.secrets and /etc/ppp/chap-secrets before adding a new VPN account.