Update README.md

Author: NovaDev404

README.md

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 ![Latest Release](https://img.shields.io/github/v/release/ProStore-iOS/ProStore?style=for-the-badge)
 
 The **best** alternative app store for iOS!  
+> ⚠️ ProStore is a WIP and is currently unfinished.  
 ProStore app source URL: https://prostore-ios.github.io/apps.json
 
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@@ -48,3 +49,4 @@ Coming soon!
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