docs(README): add poetry badge

Author: devbruce

README.md

@@ -9,6 +9,8 @@
     <img src="https://img.shields.io/badge/Python-3.13-blue?style=flat&logo=python" alt="python" />
     <img src="https://img.shields.io/badge/FastAPI-0.115-brightgreen?style=flat&logo=fastapi" alt="fastapi" />
     <img src="https://img.shields.io/badge/Dependency Injector-4.45-skyblue?style=flat" alt="dependency-injector" />
+    <br>
+    <img src="https://img.shields.io/endpoint?url=https://python-poetry.org/badge/v0.json" alt="poetry" />
 </p>
 
 > [!NOTE]