Barcode scanner implementation : Integrating first time

	- Added zxing scnner 'android' library from zxing-master osp. Other two, 'android-intergarion' and 'android-core', packeges copied to 'android' zxing lib
	- Added BarCodeScanner activity to project
	- Invoked Barcode scanner Scan button click
	- Currently scan result is display in dialog