add contrib directory and mv get-stage3 to that

[liangchenye]

Signed-off-by: liangchenye [email protected]

[liangchenye]

add contrib and mv get-stage3 to a directory called 'rootfs-gentoo-builder' (#4)

@wking not sure if you could accept the name of 'rootfs-gentoo-builder' :)

[wking]

On Wed, Jan 27, 2016 at 01:11:18AM -0800, 梁辰晔 (Liang Chenye) wrote:

@wking not sure if you could accept the name of
'rootfs-gentoo-builder' :)

I don't mind, but unless we expect to have multiple builders (and I
can't see why we'd need them), I'd just call the directory
‘rootfs-builder’. Then the implementation can change from being
Gentoo-based to whatever without consumers needing to care.

[mrunalp]

LGTM