Add description to card metadata (#1)

- Add description to card metadata (b1f82356e6c56d0b3509615a3b8f71584beaf4c1)

README.md

@@ -1,6 +1,6 @@
 ---
 title: GLUE
-emoji: 🤗 
+emoji: 🤗
 colorFrom: blue
 colorTo: red
 sdk: gradio
@@ -8,10 +8,13 @@ sdk_version: 3.0.2
 app_file: app.py
 pinned: false
 tags:
-- evaluate
-- metric
+  - evaluate
+  - metric
+description: |-
+  GLUE, the General Language Understanding Evaluation benchmark
+  (https://gluebenchmark.com/) is a collection of resources for training,
+  evaluating, and analyzing natural language understanding systems.
 ---
-
 # Metric Card for GLUE
 
 ## Metric description