add waffle.io badge to readme

Author: linkesch

README.md

@@ -4,6 +4,7 @@
 [![Dependency Status](http://www.versioneye.com/user/projects/53f742dce09da3467d000389/badge.svg?style=flat)](http://www.versioneye.com/user/projects/53f742dce09da3467d000389)
 [![Dependency Status](http://www.versioneye.com/user/projects/53f742e2e09da3dca800038f/badge.svg?style=flat)](http://www.versioneye.com/user/projects/53f742e2e09da3dca800038f)
 [![Codacy Badge](https://www.codacy.com/project/badge/1f8565ed2e554e4fa952ec4da6a2080b)](https://www.codacy.com/public/orthes/mediumeditorinsertplugin)
+[![Stories in Ready](https://badge.waffle.io/orthes/medium-editor-insert-plugin.svg?label=ready&title=Ready)](http://waffle.io/orthes/medium-editor-insert-plugin)
 
 This plugin expands capabilities of [MediumEditor](https://github.com/daviferreira/medium-editor) (a clone of medium.com WYSIWYG editor) and it enables users to insert into the editor various types of content (depending on available addons).