Update README.md

README.md

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 ## Text Guide
 
-1. Star (if you like) and fork this repo
+1. Star (if you like) and fork this repo (keep it PUBLIC, private repo is not supported)
 1. Go to the **Action** tab in your forked repo
     ![Action Tab](https://docs.github.com/assets/images/help/repository/actions-tab.png)
 1. In the left sidebar, click the **Build WSA** workflow.