Doc - complete README about the app, release and sources

README.md

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+# Random Teams
+Random Teams is an Android app to generate random teams for your different sport games. 
+In this application, you can:
+- Add new player
+- Select your players
+- Draw teams
+
+## Sources
+Sources of Random Teams app are available on [GitHub](https://github.com/Liscare/RandomTeams). However, contributions are not authorized until now.
+
+## Release
+The app is not available on Google Play Store yet. You can find beta version.
+
+## Icon
 White foreground of icon app from [Flaticon](https://www.flaticon.com) created by [pongsakornRed](https://www.flaticon.com/authors/pongsakornred) (on [Flaticon licence](https://www.freepikcompany.com/legal#nav-flaticon)).