update data structure

README.md

@@ -18,7 +18,18 @@ The difference between SQLNet and this baseline model is, Select-Number and Wher
 
 ## Start to train
 
-Firstly, download the provided datasets at ~/data_nl2sql/ including train.json, train.tables.json, dev.json, dev.tables.json and char_embedding.
+Firstly, download the provided datasets at ~/data_nl2sql/, which includes train.json, train.tables.json, dev.json, dev.tables.json and char_embedding.
+
+├── data
+│ ├── train
+│ │ ├── train.json
+│ │ ├── train.tables.json
+│ ├── dev
+│ │ ├── dev.json
+│ │ ├── dev.tables.json
+├── char_embedding
+
+
 ```
 mkdir ~/nl2sql
 cd ~/nl2sql/