Added project README

README.md

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+# ZBar Barcode Scanner Plugin
+
+This plugin integrates with the [ZBar](http://zbar.sourceforge.net/) library,
+exposing a JavaScript interface for scanning barcodes (QR, 2D, etc).
+
+## API
+
+### Scan barcode
+
+    cloudSky.zBar.scan(params, onSuccess, onFailure)
+
+Arguments:
+
+- **params**: _Unused for now. Will be an object in the future if we extend this plugin with options to specify scannable barcode types, etc._
+- **onSuccess**: function (s) {...} _Callback for successful scan._
+- **onFailure**: function (s) {...} _Callback for cancelled scan or error._
+
+Return:
+
+- success('scanned bar code') _Successful scan with value of scanned code_
+- error('cancelled') _If user cancelled the scan (with back button etc)_
+- error('misc error message') _Misc failure_