Add evaluation results on the default config of billsum

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Your model has been evaluated on the default config of the [billsum](https://huggingface.co/datasets/billsum) dataset by

@pszemraj

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README.md

@@ -274,6 +274,39 @@ model-index:
       type: gen_len
       value: 231.0762
       verified: true
+  - task:
+      type: summarization
+      name: Summarization
+    dataset:
+      name: billsum
+      type: billsum
+      config: default
+      split: test
+    metrics:
+    - name: ROUGE-1
+      type: rouge
+      value: 36.8502
+      verified: true
+    - name: ROUGE-2
+      type: rouge
+      value: 15.9147
+      verified: true
+    - name: ROUGE-L
+      type: rouge
+      value: 23.4762
+      verified: true
+    - name: ROUGE-LSUM
+      type: rouge
+      value: 30.9597
+      verified: true
+    - name: loss
+      type: loss
+      value: 3.878790855407715
+      verified: true
+    - name: gen_len
+      type: gen_len
+      value: 131.3622
+      verified: true
 ---
 
 # Longformer Encoder-Decoder (LED) for Narrative-Esque Long Text Summarization