Sample systemd service init file please

[T o n g <mlist4suntong@yahoo.com>]

Hi, 

Can you provide me a sample systemd service init file, that correspond to 
init.d script please? I.e., the corresponding file for systemd to 
replace /etc/init.d/service. 

My package have that /etc/init.d/service file, but I want to create one 
for systemd as well. I am asking because I don't even know what that file 
is called, so I didn't find any relevant info from the internet.

Thanks