Add multilingual to the language tag

Hi! A PR to add multilingual to the language tag to improve the referencing.

README.md

@@ -1,19 +1,20 @@
 ---
-language: 
+language:
 - fr
 - de
+- multilingual
 license: mit
 tags:
 - sentence_embedding
 - search
-- pytorch 
-- xlm-roberta 
+- pytorch
+- xlm-roberta
 - roberta
 - xlm-r-distilroberta-base-paraphrase-v1
 datasets:
 - stsb_multi_mt
 metrics:
-- Spearman’s rank correlation
+- Spearman�s rank correlation
 - cosine similarity
 ---