docs: create minimal model card

README.md

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+---
+datasets:
+- PaulLerner/triviaqa_for_viquae
+---
+Model trained on TriviaQA, filtered of all questions used in ViQuAE, as described in https://paullerner.github.io/ViQuAE/index.html#reading-comprehension but after fixing the loss (mean-pooling instead of max-pooling, see https://github.com/facebookresearch/DPR/issues/244)