Update README.md

Author: TimBarham

README.md

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 BarcodeScanner
 ==============
 
+**Note: This repository is no longer maintained. The official repository is now at [phonegap/phonegap-plugin-barcodescanner](http://github.com/phonegap/phonegap-plugin-barcodescanner).**
+
 Cross-platform BarcodeScanner for Cordova / PhoneGap.
 
 Follows the [Cordova Plugin spec](http://cordova.apache.org/docs/en/3.0.0/plugin_ref_spec.md), so that it works with [Plugman](https://github.com/apache/cordova-plugman).