Add template for snx-rs

[Etn40ff]

First time contributor here please forgive any breach of nettiquette.
(Also a new void user after many years on gentoo but that's a different story.)

This PR packages the CLI parts of ancwrd1/snx-rs

Testing the changes

• I tested the changes in this PR: briefly

New package

• This new package conforms to the package requirements: YES

Local build testing

• I built this PR locally for my native architecture, (x86_64-glibc)

[Duncaen]

We generally have a somewhat uniform order of the variables in the template file, please change this to follow that.

I usually use xnew from xtools which has a template template: https://github.com/leahneukirchen/xtools/blob/41b258f3962f0f11383d29cdd14131dfc4d1becc/xnew#L41-L64

Generally its:

• the package: pkgname, version, revision
• how to build the package: build_style, configure_args, make_*
• what does the build depend on: *depends
• metadata: short_desc, maintainer, license, homepage, changelog
• sources: distfiles, checksum

[Etn40ff]

Thank you for the review, I changed the order of entries as requested.

As a side note: I got the order in my first version from mmv-rs, should I open a PR to reorder that template as well?