Add task to enable widget

See docs: https://huggingface.co/docs/hub/models-widgets#enabling-a-widget

README.md

@@ -1,6 +1,8 @@
 ---
 language: en
-tags: deberta-v1
+tags: 
+- deberta-v1
+- fill-mask
 thumbnail: https://huggingface.co/front/thumbnails/microsoft.png
 license: mit
 ---