Add Google Play link to README
@ -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
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