Add GitHub action in Readme

[gndelia]

Hi,
I created a small open source GitHub Action that can be used to upload from GitHub the resource files (for instance, every time we merge a PR against a stable branch, or on a cron job fashion). Here's the action in the marketplace https://github.com/marketplace/actions/onesky-file-uploader

This issue is to get approval to add it to the Readme just like the wrappers are created. Is it ok if I create a PR for that?

Thanks!