feat: include downloads

Author: ALameLlama

README.md

@@ -3,6 +3,7 @@
 <p align="center">
 <a href="https://github.com/ALameLlama/ray-rust/actions/workflows/publish.yml"><img src="https://img.shields.io/github/actions/workflow/status/ALameLlama/ray-rust/.github/workflows/publish.yml" alt="Build + Test Status"></a>
 <a href="https://crates.io/crates/ray-rust"><img src="https://img.shields.io/crates/v/ray-rust" alt="Latest Stable Version"></a>
+<a href="https://crates.io/crates/ray-rust"><img alt="Crates.io Total Downloads" src="https://img.shields.io/crates/d/ray-rust"></a>
 <a href="https://github.com/ALameLlama/ray-rust/blob/master/LICENSE"><img src="https://img.shields.io/badge/License-MIT-yellow.svg" alt="License"></a>
 </p>