Add dataset COrpus of Urdu News TExt Reuse (COUNTER).
Just a small revision from simon's review: 20KB for the dummy_data.zip is fine, you can keep them this way. Also the CI is failing because of an error `tests/test_file_utils.py::TempSeedTest::test_tensorflow` that is not related to your dataset and is fixed on master. You can ignore it merging since the Ci is fixed on master