docs: add a badge for the conventional commits standard

Author: lppedd

README.md

@@ -13,6 +13,7 @@
 [![build](https://img.shields.io/github/actions/workflow/status/lppedd/idea-conventional-commit/build.yml.svg?branch=master)](https://github.com/lppedd/idea-conventional-commit/actions/workflows/build.yml)
 [![idea](https://img.shields.io/badge/platform-2025.3-ff7700.svg?logo=intellij-idea)](https://www.jetbrains.com/idea/)
 [![kotlin](https://img.shields.io/badge/kotlin-2.2.21-blue.svg?logo=kotlin)](https://kotlinlang.org)
+[![conventional commits](https://img.shields.io/badge/conventional%20commits-1.0.0-%23FE5196?logo=conventionalcommits)](https://conventionalcommits.org)
 
 </div>