Create Zig.gitignore

[svc-user]

Reasons for making this change:

Zig is a new, modern take on C with a still growing userbase and active development. The growing userbase means more reporitories for which a Zig gitignore template is a little thing that makes sense in a busy day.

The Zig compiler includes its own build system, which generates two folders in the project root. This is the recommended system for building Zig projects.

Links to documentation supporting these rule changes:

Zig build system docs

Link to application or project’s homepage:

Zig language homepage

[Tythos]

There are three open PRs for the same change (#4354 , #4294 , and this one). Recommend this PR be accepted and others closed. Changes are identical (+/- a comment line) and build artifact structures have mostly stabilized in zig compiler passes (as of v0.12).