Update README.md, data/austria_train.csv, data/switzerland_train.csv,...

Update README.md, data/austria_train.csv, data/switzerland_train.csv, data/lithuania_train.csv, data/all_test.csv, args.py, client.py, get_data.py, main.py, model.py, pytorch_datasets_s1.py, pytorch_datasets_s2.py, pytorch_utils.py, server.py, whitening.py