Add evaluation results on the default config and test split of billsum

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

@sam-mosaic

, using the predictions stored [here](https://huggingface.co/datasets/autoevaluate/autoeval-eval-billsum-default-e23aac-2376574533).\
Accept this pull request to see the results displayed on the [Hub leaderboard](https://huggingface.co/spaces/autoevaluate/leaderboards?dataset=billsum).\
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README.md

@@ -1,11 +1,46 @@
 ---
-
 language: en
 license: apache-2.0
 datasets:
 - big_patent
 tags:
 - summarization
+model-index:
+- name: google/bigbird-pegasus-large-bigpatent
+  results:
+  - task:
+      type: summarization
+      name: Summarization
+    dataset:
+      name: billsum
+      type: billsum
+      config: default
+      split: test
+    metrics:
+    - name: ROUGE-1
+      type: rouge
+      value: 29.5077
+      verified: true
+    - name: ROUGE-2
+      type: rouge
+      value: 10.6392
+      verified: true
+    - name: ROUGE-L
+      type: rouge
+      value: 20.7457
+      verified: true
+    - name: ROUGE-LSUM
+      type: rouge
+      value: 23.4562
+      verified: true
+    - name: loss
+      type: loss
+      value: 3.764145612716675
+      verified: true
+    - name: gen_len
+      type: gen_len
+      value: 139.0
+      verified: true
 ---
 
 # BigBirdPegasus model (large)