Adds store badges to README.md.

README.md

@@ -4,7 +4,9 @@
 
 Tusky is a beautiful Android client for [Mastodon](https://github.com/tootsuite/mastodon). Mastodon is a GNU social-compatible federated social network. That means not one entity controls the whole network, rather, like e-mail, volunteers and organisations operate their own independent servers, users from which can all interact with each other seamlessly.
 
-It is currently available on [Google Play](https://play.google.com/store/apps/details?id=com.keylesspalace.tusky).
+[<img src="https://f-droid.org/badge/get-it-on.png" alt="Get it on F-Droid" height="80" />](https://f-droid.org/repository/browse/?fdid=com.keylesspalace.tusky)
+[<img src="https://play.google.com/intl/en_us/badges/images/generic/en_badge_web_generic.png" alt="Get it on Google Play" height="80" />](https://play.google.com/store/apps/details?id=com.keylesspalace.tusky&utm_source=github&pcampaignid=MKT-Other-global-all-co-prtnr-py-PartBadge-Mar2515-1)
+[<img src="https://images-na.ssl-images-amazon.com/images/G/01/mobile-apps/devportal2/res/images/amazon-underground-app-us-black.png" alt="Available at Amazon" height="80" />](https://www.amazon.com/gp/product/B06ZYXT88G/ref=mas_pm_tusky)
 
 ## Features