doc (readme): added link to tuotrial

README.md

@@ -84,6 +84,11 @@ Please follow this guidelines when reporting bugs and feature requests:
 
 Thanks for understanding!
 
+# Tutorial with backend implmentation 
+
+- [Complete example with backend implementation in Node.js](https://ciphertrick.com/file-upload-angular-nodejs/). 
+
+
 ### License
 
 The MIT License (see the [LICENSE](https://github.com/valor-software/ng2-file-upload/blob/master/LICENSE) file for the full text)

src/file-upload/file-type.class.ts

@@ -100,7 +100,6 @@ export class FileType {
       'tiff': 'image',
       'cr2': 'image',
       'dwg': 'image',
-      'dwf': 'image',
       'cdr': 'image',
       'ai': 'image',
       'indd': 'image',