First you need to download strongSwan VPN Client on your Android TV from the Play Store.
Open strongSwan app and click on Add VPN Profile and ente the following details:
Server: Any of server mentioned here
VPN Type: IKEV2 EAP (Username/Password)
Username: LimeVPN Username
Password: LimeVPN Password
CA Certificate: Check the option “Select Automatically”
Profile name: A name of your choice.
Click on Save.
Click on the profile to connect.