Update README.md

Add the OSL link

Author: woshimajintao

README.md

@@ -3,7 +3,7 @@
 [![Documentation Status](https://img.shields.io/badge/docs-online-brightgreen)](https://opensportslab.github.io/VideoAnnotationTool/)
 
 A **PyQt6-based GUI** for analyzing and annotating **[OSL format](https://opensportslab.github.io/VideoAnnotationTool/OSL/)** datasets (OpenSportsLab).
----
+
 
 ## Features