The Go implementation is not done yet! But it will be soon. In the meantime, feel free to use the Linux kernel implementation, which works quite well and has extensive documentation and man pages:
If you join the mailing list [1], there'll be an announcement when it's ready, which hopefully won't be before long. Other perks include free stickers too :D [2].
[1] Send a blank email to wireguard-join at lists dot zx2c4 dot com.
But I use a Mac so I can’t join the VPN I made :/