Add SO question

README.md

@@ -58,6 +58,7 @@ Wiki should be detail, up to date and well structured. It should be easy to find
 - [How to style a JSON block in GitHub Wiki?](https://stackoverflow.com/questions/14901245/how-to-style-a-json-block-in-github-wiki)
 - [Render package documentation into GitHub wiki](https://stackoverflow.com/questions/27451937/render-package-documentation-into-github-wiki)
 - [How to make "spoiler" text in GitHub Wiki pages](https://stackoverflow.com/questions/32814161/how-to-make-spoiler-text-in-github-wiki-pages)
+- [How to integrate a GitHub wiki into the main project](https://stackoverflow.com/questions/6941688/how-to-integrate-a-github-wiki-into-the-main-project)
 
 ## Contributing
 Contributions are very welcome! Please read the [contribution guideline](contributing.md) first.