List of known exporters in README

[pdurbin]

Description

The list of known exporters in the README of this repo is a good start but I was going for a few things in the inventory I had going in the main guides (now removed):

• The machine readable exporter name.
• The Maven Central landing page for each exporter.
• URLs for downloading the stable release vs snapshot (I see there's a "Download" column with "TBD" at least).

I'm still not 100% sure the community is better served with the inventory in the README but let's talk about it as well as the items above.

[pdurbin]

• The machine readable exporter name.

Done in #52

• The Maven Central landing page for each exporter.

Meh, I guess we don't need this. Less is more.

• URLs for downloading the stable release vs snapshot (I see there's a "Download" column with "TBD" at least).

Done in #51

Good enough. Closing. For context, I'm working on this:

• Test and describe RO-Crate support in Guides IQSS/dataverse#10744

I still wonder if we should have the list in the guides but I'm ok with this README for now.