[m-rev.] for review: add another sample: mcowsay

[Peter Wang]

On Wed, 15 Jun 2022 16:03:53 +1000 Julien Fischer <jfischer at opturion.com> wrote:
> 
> For review by anyone.
> 
> ---------------------
> 
> Add another sample: mcowsay.
> 
> samples/mcowsay.m:
>      A Mercury version of the cowsay program. It serves an more extended
>      example (but still small) example of how to write command line
>      utilities in Mercury.
> 
> samples/README.md:
>      Include the new sample.
> 
> samples/Mmakefile:
>      Include the new sample.
> 
>      Put the list of sample programs in alphabetical order.

That looks fine.

Peter