Add flattr button

README.md

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+[![Flattr this git repo](http://api.flattr.com/button/flattr-badge-large.png)](https://flattr.com/submit/auto?user_id=almasaeed2010&url=http://almsaeedstudio.com&title=AdminLTE&language=&tags=github&category=software)
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 **AdminLTE** -- is a fully responsive admin template. Based on **Bootstrap 3** framework. Highly customizable and easy to use. Fits many screen resolutions from small mobile devices to large desktops. Check out the live preview now and see for yourself. 
 
 **Live Preview: http://almsaeedstudio.com/preview/**