title: cordova-firebase-plugin configuration for iOS
body: <p>I am developing an app with Cordova. On Android, the Firebase plugin works well, but I am facing this issue on iOS:</p>
  
  <pre><code>&lt;Error&gt; [Firebase/Core][I-COR000009] The GOOGLE_APP_ID either in the plist
  file 'GoogleService-Info.plist' or the one set in the customized options
  is invalid. If you are using the plist file, use the iOS version of bundle
  identifier to download the file, and do not manually edit the
  GOOGLE_APP_ID. You may change your app's bundle identifier to '(null)'. Or
  you can download a new configuration file that matches your bundle
  identifier from https://console.firebase.google.com/ and replace the
  current one.
  </code></pre>
  
  <hr>
  
  <pre><code>*** Terminating app due to uncaught exception 'com.firebase.core', reason:
  'Configuration fails. It may be caused by an invalid GOOGLE_APP_ID in
  GoogleService-Info.plist or set in the customized options.'
  </code></pre>
  
  <p>I placed GoogleService-Info.plist in the root folder of the project, in the same folder of the <code>.xcodeproj</code> file.</p>