Acknowledgement for @qingshi163

Author: youknowone

README.md

@@ -7,3 +7,9 @@ This is not an official malachite project. Please directly use malachite unless
 # Performance
 
 See https://github.com/tczajka/bigint-benchmark-rs
+
+# Acknowledgement
+
+`malachite-bigint` was created by [Steve Shi](https://github.com/qingshi163) to provide an alternative bigint implementation for [RustPython](https://github.com/RustPython/RustPython.git).
+
+This project is contributed to the malachite project and will be integrated to malachite 0.5.0.