doc: update add billing note

ShehanYjoz · Mar 15, 2022 · 7a12343 · 7a12343
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 This library provides Google places autocomplete widgets for flutter. It uses [google_maps_webservice](https://github.com/lejard-h/google_maps_webservice) library which directly refer to the official [documentation](https://developers.google.com/maps/web-services/) for google maps web service. 
 
+According to https://stackoverflow.com/a/52545293, you need to enable billing on your account, even if you are only using the free quota.
+
 
 ## Installation