You can make it a minor-mode and publish on MELPA. I found it on Emacs
Planet some days ago. I use it.

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On Fri, May 26, 2017 at 9:08 PM, Tom Hinton <t@larkery.com> wrote:

> Hi,
>
> I made a thing, visible here:
>
>   https://github.com/larkery/emacs/blob/master/site-lisp/
> org-numbers-overlay.el
>
> Which adds overlays to headings in org-mode to display section numbering
> in the buffer, and keeps it up to date as you edit. This helps me when
> relating exported PDF output (or people's comments on it) back to the
> original org file.
>
> Anyway it turns out it was helpful to some other people too, and one of
> them suggested that I contribute it directly and that to do so I should
> email this address, and now here we are.
>
> Let me know if this fits into the org development master plan.
>
> Thanks,
>
> Tom Hinton
>
>