Julibert model card (#7868)

* Julibert model card

* Fix text

model_cards/jordimas/julibert/README.md

+---
+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
+
+
+
+