Update README.md

README.md

@@ -11,3 +11,13 @@ This is the Japanese subset of [TyDi QA](https://github.com/google-research-data
   - validation: 1709 (original: 18670)
 
 - secondary task ... no japanese data
+
+
+**filtering script**
+
+```python
+from datasets import load_dataset
+
+dataset = load_dataset("tydiqa", "secondary_task")
+ja_dataset = dataset.filter(lambda example: example['id'].startswith('jp'))
+```