Update Contributing to the Code.rst

documentation/source/readme/Contributing to the Code.rst

@@ -8,7 +8,7 @@ Code Style
 
 Develop, review, and test code following the OpenHarmony coding standards. Make sure code is written in the same style.
 
-* C++ Coding Style Guide
+* `C++ Coding Style Guide <https://git.ostc-eu.org/docs/developer-guide/-/blob/master/documentation/source/readme/C++%20Coding%20Style%20Guide.rst>`_.
 * C Coding Style Guide
 * JavaScript Coding Style Guide
 * Python Coding Style Guide