C coding added to readme

documentation/source/definitions.rst

+.. |main_project_name| replace:: OpenHarmony
+.. |main_project_name_bold| replace:: **openharmony**
+.. |main_project_tag| replace:: openharmony
+

documentation/source/index.rst

-Welcome to Harmony-OS documentation!
+.. include:: definitions.rst
+
+Welcome to |main_project_name| documentation!
 ======================================
 
 .. toctree::

documentation/source/readme/Readme-EN.rst

@@ -6,8 +6,11 @@ Contributing Documents
    
    Code of Conduct
    Communication in Community
+   Contribution Process
    Contributing to the Code
+   C++ Coding Style Guide
+   JavaScript Coding Style Guide
    Contributing to the Documentation
-   Contribution Process
    reStructuredText Basics
+   FAQs