Add description to card metadata (#1)

- Add description to card metadata (453b129e5b253cc7d23aa5e2194bc70d28ec4524)

README.md

@@ -1,6 +1,6 @@
 ---
 title: SQuAD v2
-emoji: 🤗 
+emoji: 🤗
 colorFrom: blue
 colorTo: red
 sdk: gradio
@@ -8,10 +8,35 @@ sdk_version: 3.0.2
 app_file: app.py
 pinned: false
 tags:
-- evaluate
-- metric
----
+  - evaluate
+  - metric
+description: >-
+  This metric wrap the official scoring script for version 2 of the Stanford
+  Question
+
+  Answering Dataset (SQuAD).
+
+
+  Stanford Question Answering Dataset (SQuAD) is a reading comprehension
+  dataset, consisting of questions posed by
+
+  crowdworkers on a set of Wikipedia articles, where the answer to every
+  question is a segment of text, or span,
+
+  from the corresponding reading passage, or the question might be unanswerable.
 
+
+  SQuAD2.0 combines the 100,000 questions in SQuAD1.1 with over 50,000
+  unanswerable questions
+
+  written adversarially by crowdworkers to look similar to answerable ones.
+
+  To do well on SQuAD2.0, systems must not only answer questions when possible,
+  but also
+
+  determine when no answer is supported by the paragraph and abstain from
+  answering.
+---
 # Metric Card for SQuAD v2
 
 ## Metric description