~eliasnaur/gio-example

ref: 1ad8d13d0f99c508d3a2528dfe349f3313acc7c5 gio-example/tabs d---------
all: initial import

Copied from the example directory of https://git.sr.ht/~eliasnaur/gio.

Signed-off-by: Elias Naur <mail@eliasnaur.com>