update Google services info plist format

updated file name and location

README.md

@@ -121,7 +121,7 @@ in AppDelegate.m add
 
 
 ### FCM config file
-In [firebase console](https://console.firebase.google.com/), you can get `google-services.json` file and place it in `android/app` directory and get `googleServices-info.plist` file and place it in `/ios` directory
+In [firebase console](https://console.firebase.google.com/), you can get `google-services.json` file and place it in `android/app` directory and get `GoogleService-Info.plist` file and place it in `/ios/your-project-name` directory (next to your `Info.plist`)
 
 ## Usage