Update README.md

Update README.md

Add verifyToken field to verify evaluation results are produced by Hugging Face's automatic model evaluator (#4)

Add evaluation results on the default config of xsum (#1)

Add evaluation results on the default config of xsum (#1)

Create README.md

Training in progress, step 5000

Training in progress, step 4500

Training in progress, step 4000

Training in progress, step 3000

Training in progress, step 2500

Training in progress, step 500

initial commit