Add evaluation results on the kmfoda--booksum config of kmfoda/booksum

Add evaluation results on the default config of xsum (#3)

Update README.md

Add evaluation results on the samsum config of samsum (#2)

format

write about updated checkpoint

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booksum link

add paper link

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Update README.md

add python usage

add copypasta as an example

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Update README.md

:art:

format

details

embellish das README

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