Merge pull request #4 from Poussinou/patch-1

Update README.md

README.md

@@ -10,7 +10,12 @@ This repository contains the open source Tailscale Android client.
 
 ## Using
 
-Available on [Play Store](https://play.google.com/store/apps/details?id=com.tailscale.ipn).
+[<img src="https://fdroid.gitlab.io/artwork/badge/get-it-on.png"
+     alt="Get it on F-Droid"
+     height="80">](https://f-droid.org/packages/com.tailscale.ipn/)
+[<img src="https://play.google.com/intl/en_us/badges/images/generic/en-play-badge.png"
+     alt="Get it on Google Play"
+     height="80">](https://play.google.com/store/apps/details?id=com.tailscale.ipn)
 
 ## Building