add dataset dict structure

README.md

@@ -52,7 +52,25 @@ size_categories:
 
 # GermEval 14 NER dataset
 
-This dataset includes the actual NER tags besides the labels and requires no code execution when loading.
+This dataset includes the actual NER tags (B-PER, B-LOC, etc.) besides the labels (0, 1, 2, ...) and requires no code execution when loading. Structured as follow
+
+```
+DatasetDict({
+    train: Dataset({
+        features: ['id', 'source', 'source_date', 'tokens', 'ner_label', 'ner_tag', 'nested_ner_label', 'nested_ner_tag'],
+        num_rows: 24002
+    })
+    validation: Dataset({
+        features: ['id', 'source', 'source_date', 'tokens', 'ner_label', 'ner_tag', 'nested_ner_label', 'nested_ner_tag'],
+        num_rows: 2200
+    })
+    test: Dataset({
+        features: ['id', 'source', 'source_date', 'tokens', 'ner_label', 'ner_tag', 'nested_ner_label', 'nested_ner_tag'],
+        num_rows: 5100
+    })
+})
+
+```
 
 # Citation
 ```