Add description to card metadata (#1)

- Add description to card metadata (57557c5a403c062f802bd06c84b9e28e9887a2dd)

README.md

@@ -1,6 +1,6 @@
 ---
 title: TER
-emoji: 🤗 
+emoji: 🤗
 colorFrom: blue
 colorTo: red
 sdk: gradio
@@ -8,10 +8,34 @@ sdk_version: 3.0.2
 app_file: app.py
 pinned: false
 tags:
-- evaluate
-- metric
----
+  - evaluate
+  - metric
+description: >-
+  TER (Translation Edit Rate, also called Translation Error Rate) is a metric to
+  quantify the edit operations that a
+
+  hypothesis requires to match a reference translation. We use the
+  implementation that is already present in sacrebleu
+
+  (https://github.com/mjpost/sacreBLEU#ter), which in turn is inspired by the
+  TERCOM implementation, which can be found
+
+  here: https://github.com/jhclark/tercom.
+
 
+  The implementation here is slightly different from sacrebleu in terms of the
+  required input format. The length of
+
+  the references and hypotheses lists need to be the same, so you may need to
+  transpose your references compared to
+
+  sacrebleu's required input format. See
+  https://github.com/huggingface/datasets/issues/3154#issuecomment-950746534
+
+
+  See the README.md file at https://github.com/mjpost/sacreBLEU#ter for more
+  information.
+---
 # Metric Card for TER
 
 ## Metric Description