Update README.md

Author: qectorlab

README.md

@@ -6,6 +6,7 @@
 [![PyPI](https://img.shields.io/pypi/v/qector-decoder-v3.svg)](https://pypi.org/project/qector-decoder-v3/)
 [![Python](https://img.shields.io/pypi/pyversions/qector-decoder-v3.svg)](https://pypi.org/project/qector-decoder-v3/)
 [![License](https://img.shields.io/badge/License-Source_Available-blue)](LICENSE)
+[![PyPI Downloads](https://img.shields.io/pypi/dm/qector-decoder-v3)](https://pypi.org/project/qector-decoder-v3/)
 
 **Source-available Rust/Python quantum error correction decoding platform.**