Add NOTE on the android-sdk's GCM library path.

Author: yyosifov

README.md

@@ -25,7 +25,7 @@ The code for the Push Plugin for NativeScript.
 
 		tns platform add android
 
-- Add google play services, as GCM is part of it. It's present in the android-sdk. Add it like this:
+- Add Google Play Services, as GCM is part of it. It's present in the android-sdk. Add it like this (NOTE: your path may be different, it depends on the installation path of the Android SDK):
 
 		tns library add android C:\Users\your_user_name\AppData\Local\Android\android-sdk\extras\google\google_play_services\libproject\google-play-services_lib\libs
 
@@ -310,4 +310,4 @@ In case the application doesn't work as expected. Here are some things you can v
 
 ### iOS
 
-- Error "Error registering: no valid 'aps-environment' entitlement string found for application" - this means that the certificates are not correctly set in the xcodeproject. Open the xcodeproject, fix them and you can even run the application from xcode to verify it's setup correctly. The bundle identifier in xcode should be the same as the "id" in the package.json file in the root of the project.
+- Error "Error registering: no valid 'aps-environment' entitlement string found for application" - this means that the certificates are not correctly set in the xcodeproject. Open the xcodeproject, fix them and you can even run the application from xcode to verify it's setup correctly. The bundle identifier in xcode should be the same as the "id" in the package.json file in the root of the project.