Create README.md (#3306)

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model_cards/jannesg/bertsson/README.md

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+---
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+language: swedish
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+---
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+# BERTSSON Models
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+The models are trained on:
+- Government Text
+- Swedish Literature
+- Swedish News
+
+Corpus size: Roughly 6B tokens.
+
+The following models are currently available:
+
+- **bertsson** - A BERT base model trained with the same hyperparameters as first published by Google.
+
+All models are cased and trained with whole word masking.
+
+Stay tuned for evaluations.