Update README.md

Author: pdgago

README.md

@@ -1,3 +1,22 @@
+[![License](https://img.shields.io/github/license/sharedlabs/sortable-list.svg?style=flat-square)](https://github.com/sharedlabs/file-uploader/blob/master/LICENSE.md)
+
 # file-uploader
 
+File uploader for multiple files with a progress bar.
+
+It uses the [offthread-image](https://github.com/sharedlabs/offthread-image) element to render the thumbnails so it performs awesome on slow devices like mobile phones.
+
+### Preview
 ![](https://media.giphy.com/media/l3q2wmnMfDGpVvnxK/giphy.gif)
+
+### Use
+```html
+<file-uploader id="fileUploader"><file-uploader>
+
+...
+this.$.fileUploader.addFile(file, {url, method, headers});
+```
+
+### Browser support
+
+Any browser that supports Polymer 1.0