Add support to OpenResty OPM

[GhaziTriki]

Hello,

It would be great to see this package being officially supported by OpenResty. Could it be done?
https://opm.openresty.org/
https://github.com/openresty/opm#author-workflow

[moteus]

I do not use Nginx/Openresty. And has no any test sytem.
Also this library hase some deps. (core part depends on data). And some writers has others deps.

So PR are welcome.