Add logo and play store link to readme

Author: fmasa

README.md

@@ -1,4 +1,14 @@
-# WFRP Master
+<p align="center">
+ <img src="https://raw.githubusercontent.com/fmasa/wfrp-master/master/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png" alt="logo"/>
+</p> 
+
+<h1 align="center">WFRP Master</h1>
+
+<p align="center">
+ <a href="https://play.google.com/store/apps/details?id=cz.frantisekmasa.dnd" target="_blank">
+  <img align="center" src="https://play.google.com/intl/en_gb/badges/static/images/badges/en_badge_web_generic.png" width="240"/>
+ </a>
+</p>
 
 ## Development