add dataset structure

README.md

@@ -37,13 +37,20 @@ There are several preprocessing processes done with this dataset.
 3. Keep the data that has score above 0,7.
 4. Add `<bt>` tag in front of the Bemba sentences to indicate that the data is generated by back-translating method.
 
-<!-- # Dataset Structure
+# Dataset Structure
+```
+DatasetDict({
+    train: Dataset({
+        features: ['text_bem', 'text_en'],
+        num_rows: 20121
+    })
+})
 ```
-
-``` -->
 
 # Reference
 
 ```
+
 1. https://tatoeba.org/
+
 ```