Refine readme

Author: Philipp Alferov

README.md

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+angular-file-saver
+=========
+Angular file saver is an AngularJS service that provides integration of [FileSaver.js](https://github.com/eligrey/FileSaver.js/) that implements the
+HTML5 W3C saveAs() FileSaver interface in browsers that do not natively support
+it. The package also comes with [Blob.js](https://github.com/eligrey/Blob.js/)
+as a dependency to provide support of wide range of browsers.
+
+##Dependencies
+- [AngularJS](https://github.com/angular/angular.js)
+- [FileSaver.js](https://github.com/eligrey/FileSaver.js/)
+- [Blob.js](https://github.com/eligrey/Blob.js/)
+
+##Installation
+With bower
+```
+$ bower install angular-file-saver
+```
+##Basic usage
+
+- Include the <code>fileSaver</code> module to yor project;
+
+- Pass <code>SaveAs</code> service as a dependency;
+
+- Invoke <code>SaveAs.saveFile()</code> with following arguments:
+
+  - `data` - data, represented as a string, an array or a [Blob object](https://developer.mozilla.org/en/docs/Web/API/Blob);
+  - `filename`
+  - `options` - set of options for the [Blob constructor](https://developer.mozilla.org/en/docs/Web/API/Blob) optional parameter if Blob object is passed as first argument)
+
+##Demo
+
+[Demo on the github project  page](http://alferov.github.io/angular-file-saver/#demo)