Add evaluation results on wmt19 dataset

Beep boop, I am a bot from Hugging Face's automatic model evaluator 👋!\
Your model has been evaluated on the [wmt19](https://huggingface.co/datasets/wmt19) dataset by

@lewtun

, using the predictions stored [here](https://huggingface.co/datasets/autoevaluate/autoeval-staging-eval-project-de1c01d5-7885055).\
Accept this pull request to see the results displayed on the [Hub leaderboard](https://huggingface.co/spaces/autoevaluate/leaderboards?dataset=wmt19).\
Evaluate your model on more datasets [here](https://huggingface.co/spaces/autoevaluate/model-evaluator?dataset=wmt19).

README.md

@@ -3,10 +3,34 @@ language: de
 widget:
 - text: My name is Karl and I live in Aachen.
 tags:
-- translation 
+- translation
 datasets:
 - wmt19
 license: gpl
+model-index:
+- name: Tanhim/translation-En2De
+  results:
+  - task:
+      type: translation
+      name: Translation
+    dataset:
+      name: wmt19
+      type: wmt19
+      config: de-en
+      split: validation
+    metrics:
+    - name: BLEU
+      type: bleu
+      value: 43.3134
+      verified: true
+    - name: loss
+      type: loss
+      value: 0.919737696647644
+      verified: true
+    - name: gen_len
+      type: gen_len
+      value: 27.8909
+      verified: true
 ---
 
 <h2> English to German Translation </h2>