Update README.md

Author: lemire

README.md

@@ -1175,6 +1175,11 @@ https://groups.google.com/forum/#!forum/roaring-bitmaps
 
 When contributing a change to the project, please run `tools/run-clangcldocker.sh` after making any changes. A github action runs on all PRs to ensure formatting is consistent with this.
 
+# Stars
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+[![Star History Chart](https://api.star-history.com/svg?repos=RoaringBitmap/CRoaring&type=Date)](https://www.star-history.com/#RoaringBitmap/CRoaring&Date)
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 # References about Roaring
 
 - Daniel Lemire, Owen Kaser, Nathan Kurz, Luca Deri, Chris O'Hara, François Saint-Jacques, Gregory Ssi-Yan-Kai, Roaring Bitmaps: Implementation of an Optimized Software Library, Software: Practice and Experience Volume 48, Issue 4 April 2018 Pages 867-895 [arXiv:1709.07821](https://arxiv.org/abs/1709.07821)