Add multilingual to the language tag (#1)

- Add multilingual to the language tag (3218dd3300b977d2b49865b5fac493a6ae95fde4)


Co-authored-by: Loïck BOURDOIS <lbourdois@users.noreply.huggingface.co>

README.md

@@ -1,8 +1,9 @@
 ---
-language: 
+language:
 - en
 - es
 - eu
+- multilingual
 ---
 
 # IXAmBERT base cased