add sdk contribution guide

Author: hatemhosny

docs/docs/contribution/README.md

@@ -49,10 +49,11 @@ This directory contains comprehensive documentation for contributors working on
 
 ### Services & Infrastructure
 
-| Document                                     | Description                                                |
-| -------------------------------------------- | ---------------------------------------------------------- |
-| [services-system.mdx](./services-system.mdx) | External services: auth, share, CDN resolution, CORS proxy |
-| [build-system.mdx](./build-system.mdx)       | Build scripts, outputs, and development workflow           |
+| Document                                     | Description                                                 |
+| -------------------------------------------- | ----------------------------------------------------------- |
+| [services-system.mdx](./services-system.mdx) | External services: auth, share, CDN resolution, CORS proxy  |
+| [build-system.mdx](./build-system.mdx)       | Build scripts, outputs, and development workflow            |
+| [sdk.mdx](./sdk.mdx)                         | SDK architecture, framework wrappers, and API communication |
 
 ### Internationalization