packaging for arch linux

[albfan]

Hi Adam,

Just FYI, I packaged your sjcam tool

https://github.com/AdamLaurie/sjcam

on AUR (Arch linux User Repositories)

https://aur.archlinux.org/packages/sjcam-git/

I couldn't find the license so I choose GPL (let me know if that's
wrong to change it) related with #5

Thanks for coding sjcam, is nice to operate a camera without get it
out of the case.

I use a sjcam M20 and works perfectly!

If I found time I would like to connect to camera without loose the
internet connection (but that's related with network manager). In any
case, if I found how to do it will open a PR on your repo.

Cheers,
Alberto