[m-rev.] for review: convert samples/REAMDE to Markdown

[Julien Fischer]

On Sun, 2 Jan 2022, Zoltan Somogyi wrote:

> On Sun, 2 Jan 2022 16:32:22 +1100 (AEDT), Julien Fischer <jfischer at opturion.com> wrote:
>> Here is a revised diff, that fixes the links.
>
> I don't know markdown well enough to review these kinds
> of diffs for md correctness. But if you commit them, I can
> look at them with an md viewer, and review them that way.

Done, along with the file renaming.
(I've been using <https://github.com/joeyespo/grip> to review the files
locally.)

Julien.