📝 Add codecov badge to README

README.md

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+# <img src="https://www.rust-lang.org/logos/rust-logo-blk.svg" width="100"> Rust template ![GitHub License](https://img.shields.io/github/license/MathieuSoysal/Exercism-Rust-Template)
 [![Static Badge](https://img.shields.io/badge/online-green?logo=gamejolt&logoColor=white&label=Benchmark%20tracks&labelColor=black&link=https%3A%2F%2Fbencher.dev%2Fconsole%2Fprojects%2Frust-template)](https://bencher.dev/console/projects/rust-template)
+[![codecov](https://codecov.io/gh/MathieuSoysal/Exercism-Rust-Template/graph/badge.svg?token=MrM1EEfgvD)](https://codecov.io/gh/MathieuSoysal/Exercism-Rust-Template)
+
 
-# <img src="https://www.rust-lang.org/logos/rust-logo-blk.svg" width="100"> Rust template ![GitHub License](https://img.shields.io/github/license/MathieuSoysal/Exercism-Rust-Template)
 Basic Rust template with rust devcontainer and some CI to test and track benchmarcks automatically.
 
 ## Ressources