Documentation for nft-sync

["Ferenc Takacs - Ancelade.com" <ferenc@xxxxxxxxxxxx>]

Hello,

I try to use the nft-sync tool ( https://git.netfilter.org/nft-sync ) 
but cannot find any documentation for make it running.

Is the project has been abandoned ? As the last commit is from 6 years 
ago.

Thanks in advance,
Brskt