update code example to Haystack 2.x, new tutorial link, website link, twitter link, Haystack description

add base model

remove square bracket (#18)

Update README.md

Add verifyToken field to verify evaluation results are produced by Hugging Face's automatic model evaluator (#10)

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Update README.md

Update README.md

Add evaluation results on the squad_v2 config of squad_v2 (#5)

Fix typo

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Update README.md

draft update for the model card

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Update README.md

add language tag

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Update README.md

Update README.md

Update README.md

Add license info

Migrate model card from transformers-repo

Update to v2