Add readme guidelines for contribution documentation

Author: marcosqlbi

_mydocs/contribute/doc-sites.md

@@ -5,7 +5,7 @@ menu_title:     Documentation Sites
 published:      true
 date:           2025-10-28
 modified:       2025-10-28
-order:          /06
+order:          /07
 next_reading:   true
 ---
 

_mydocs/contribute/readme-guidelines.md

@@ -0,0 +1,25 @@
+---
+layout:         page
+title:          Readme guidelines
+menu_title:     Readme guidelines
+published:      true
+date:           2025-12-31
+modified:       2025-12-31
+order:          /06
+next_reading:   true
+---
+
+The  `README.md` file with your library will be displayed alongside your library on [daxlib.org](https://daxlib.org/). Its content must follow these guidelines to ensure consistency and to be approved for publication.
+
+- **External links** are permitted only if they are safe and trustworthy. All links will be verified using Google Safe Browsing (https://transparencyreport.google.com/safe-browsing/search).
+- **Do not** include images that **imitate**, replicate, or closely resemble **UI elements** from the DAX Lib website.
+- **Do not embed images** or assets as Base64. **Use standard URLs** to reference all media assets.
+- Image **aspect ratio must be preserved**. Prefer specifying only the `width` attribute so the height scales automatically.
+- **Large images** should be **optimized** to maintain reasonable performance.
+- **Do not wrap images in links**. Images must not be clickable or redirect users.
+- **Avoid inline CSS or styling** that overrides global styles (if applicable to your system).
+- **Do not embed iframe** objects.
+
+You can include in the `README.md` file a link to a sample file to showcase how to use the functions in your library.
+
+If you need a more comprehensive documentation site, consider creating a dedicated documentation website as described in the [Documentation sites](doc-sites.md) section.