Originally we had planned to release workshop support as part of ALPHA 15 but have decided to release it early as Alpha 14.1. This is just the first step in Steam integration and therefore only supports Ship/Vessel templates and languages for now.
If you would like to upload your own items to the workshop we have made a guide here: https://steamcommunity.com/sharedfiles/filedetails/?id=1461693416
For more information about this release and how it all works please see the change notes here : forum post