Add description to card metadata

FrugalScore is a reference-based metric for NLG models evaluation. It is based on a distillation approach that allows to learn a fixed, low cost version of any expensive NLG metric, while retaining most of its original performance.

README.md

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 ---
-title: 
-emoji: 🤗 
+title: null
+emoji: 🤗
 colorFrom: blue
 colorTo: red
 sdk: gradio
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 app_file: app.py
 pinned: false
 tags:
-- evaluate
-- metric
+  - evaluate
+  - metric
+description: >-
+  FrugalScore is a reference-based metric for NLG models evaluation. It is based
+  on a distillation approach that allows to learn a fixed, low cost version of
+  any expensive NLG metric, while retaining most of its original performance.
 ---
 
-
 ## Metric Description
 FrugalScore is a reference-based metric for Natural Language Generation (NLG) model evaluation. It is based on a distillation approach that allows to learn a fixed, low cost version of any expensive NLG metric, while retaining most of its original performance.