instructions for joining internal

README.md

@@ -17,6 +17,8 @@ Open Food Facts is a food products database made by everyone, for everyone. Open
 [![Open Source Helpers](https://www.codetriage.com/openfoodfacts/openfoodfacts-androidapp/badges/users.svg)](https://www.codetriage.com/openfoodfacts/openfoodfacts-androidapp)
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+[Join the Play Store Beta](https://play.google.com/store/apps/details?id=org.openfoodfacts.scanner) (rather stable) - [Join the Play Store internal build](https://play.google.com/apps/internaltest/4699092342921529278) (bleeding edge). You might need communicating your email for whitelisting to teolemon on slack (or pierre at openfoodfacts org)
+
 ## What is Open Food Facts?
 
 ### A food products database