update acknowledgments

README.md

@@ -114,6 +114,10 @@ In addition, we provide code `dataset_evaluation.py` for evaluating time series
 python dataset_evaluation.py --root_path <dataset root path> --log_path <output log path>
 ```
 
+## Acknowledgments
+
+UTSD is mostly built from the Internet public time series dataset, which comes from different research teams and providers. We sincerely thank all individuals and organizations who have contributed the data. Without their generous sharing, this dataset would not have existed.
+
 ## Citation