Add config for dataverse-client-javascript

[pdurbin]

There's a new API client library for Dataverse in Javascript!

https://github.com/IQSS/dataverse-client-javascript is the repo and I see a "test" folder. We should get the tests running on https://jenkins.dataverse.org

[donsizemore]

pending IQSS/dataverse-client-javascript#1

[pdurbin]

Some new testing instructions just got merged:

https://github.com/IQSS/dataverse-client-javascript#tests-and-checks