Add languages

Mistral has published a blog note (https://mistral.ai/news/mixtral-of-experts/), in which they indicate the languages on which the model has been trained, which I therefore add with this PR :)

README.md

@@ -1,6 +1,13 @@
 ---
 license: apache-2.0
+language:
+- en 
+- fr 
+- it 
+- es 
+- de
 ---
+
 # Mixtral 7b 8 Expert
 
 ![image/png](https://cdn-uploads.huggingface.co/production/uploads/62e3b6ab0c2a907c388e4965/6m3e2d2BNXDjy6_qHd2LT.png)