Update README.md

Author: arriolac

README.md

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+![GitHub contributors](https://img.shields.io/github/contributors/googlemaps/maps-sdk-for-ios-samples)
+![Apache-2.0](https://img.shields.io/badge/license-Apache-blue)
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 # Google Maps SDK for iOS and Google Places API for iOS sample code
 
 This repository contains sample code for use with the Google Maps SDK for iOS