update readme (#40)

Author: AndSonder

README.md

@@ -62,3 +62,6 @@
 
 + [动态 Batch](./docs/13_dynamic_batch/README.md)
 + [Page Attention](./docs/14_page_attention/README.md)
+
+
+[![Star History Chart](https://api.star-history.com/svg?repos=PaddleJitLab/CUDATutorial&type=Date)](https://star-history.com/#PaddleJitLab/CUDATutorial&Date)