Update README.md

Author: OJddJO

README.md

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 # WordLanguage
 
+[![C/C++ CI](https://github.com/OJddJO/WordLanguage/actions/workflows/c-cpp.yml/badge.svg)](https://github.com/OJddJO/WordLanguage/actions/workflows/c-cpp.yml)
+
 > [!IMPORTANT]
 > Word is still in development, some functionalities may not work as expected or may be missing. Please report any issues you encounter.