add star history

Author: wanqing0421

README.md

@@ -74,3 +74,7 @@ PhasicFlow relies on the following external libraries:
 
 * **Kokkos:** A community-led performance portability ecosystem within the Linux Foundation's High-Performance Software Foundation (HPSF). ([https://github.com/kokkos/kokkos](https://github.com/kokkos/kokkos))
 * **CLI11 1.8:** A command-line interface parser developed by the University of Cincinnati. ([https://github.com/CLIUtils/CLI11](https://github.com/CLIUtils/CLI11))
+
+## Star History
+
+[![Star History Chart](https://api.star-history.com/svg?repos=PhasicFlow/phasicFlow&type=Date)](https://www.star-history.com/#PhasicFlow/phasicFlow&Date)