Add playstore link to readme.md

Author: phpbg

readme.md

@@ -11,6 +11,8 @@ Synchronize your phone with your DAV server, the easy way.
 * Secure storage of your credentials
 * Preserve timestamps if you use Nextcloud as DAV server
 
+<a href='https://play.google.com/store/apps/details?id=com.phpbg.easysync&pcampaignid=pcampaignidMKT-Other-global-all-co-prtnr-py-PartBadge-Mar2515-1'><img width='240' alt='Get it on Google Play' src='https://play.google.com/intl/en_us/badges/static/images/badges/en_badge_web_generic.png'/><img width='90' alt='Get it on Google Play' src='./playstore-qr.png'/></a>
+
 ## FAQ
 
 ### What is synchronized