Migrate model card from transformers-repo

Read announcement at https://discuss.huggingface.co/t/announcement-all-model-cards-will-be-migrated-to-hf-co-model-repos/2755
Original file history: https://github.com/huggingface/transformers/commits/master/model_cards/jordimas/julibert/README.md

README.md

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+---
+language: ca
+---
+
+## Introduction
+
+
+Download the model here:
+
+* Catalan Roberta model: [julibert-2020-11-10.zip](https://www.softcatala.org/pub/softcatala/julibert/julibert-2020-11-10.zip)
+
+## What's this?
+
+Source code: https://github.com/Softcatala/julibert
+
+* Corpus: Oscar Catalan Corpus (3,8G)
+* Model type: Roberta
+* Vocabulary size: 50265
+* Steps: 500000
+
+
+
+