add LeNER-Br dataset
I don't know what happened, my first commit passed on all checks, but after just a README.md update one of the scripts failed, is it normal? 😕  Looks like a flaky connection error, I've launched a re-run, it should be fine :) The RemoteDatasetTest error in the CI is just a connection error, we can ignore it merging since the CI is fixed on master
Adding the LeNER-Br dataset, a Portuguese language dataset for named entity recognition 