Update README

Author: SWHL

README.md

@@ -150,8 +150,11 @@
     ```shell
     python yolov5_yaml_2_coco.py --yaml_path dataset/YOLOV5_yaml/sample.yaml
     ```
+</details>
+
+#### darknet格式数据 → COCO
+<details>
 
-  #### darknet格式数据 → COCO
   - darknet训练数据目录结构（详情参见`dataset/darknet`）：
     ```text
     darknet

docs/README_en.md

@@ -151,8 +151,11 @@ English | [简体中文](../README.md)
   ```shell
   python yolov5_yaml_2_coco.py --yaml_path dataset/YOLOV5_yaml/sample.yaml
   ```
+</details>
 
 #### darknet format data → COCO
+<details>
+
 - Darknet training data directory structure (see `dataset/darknet` for details).
   ```text
   darknet