Add evaluation data to acronym_identification (#4561)

Commit from https://github.com/huggingface/datasets/commit/f6de6dcac81764c365423f5822f1989897146e64

README.md

@@ -19,6 +19,15 @@ task_ids:
 - token-classification-other-acronym-identification
 paperswithcode_id: acronym-identification
 pretty_name: Acronym Identification Dataset
+train-eval-index:
+- config: default
+  task: token-classification
+  task_id: entity_extraction
+  splits:
+    eval_split: test
+  col_mapping:
+    tokens: tokens
+    labels: tags
 ---
 
 # Dataset Card for Acronym Identification Dataset