Merge pull request #405 from android/calren-patch-1

Add Google Play link to README

README.md

@@ -1,5 +1,7 @@
 ![Now in Android](docs/images/nia-splash.jpg "Now in Android")
 
+<a href="https://play.google.com/store/apps/details?id=com.google.samples.apps.nowinandroid"><img src="https://play.google.com/intl/en_us/badges/static/images/badges/en_badge_web_generic.png" height="70"></a>
+
 Now in Android App
 ==================