Update README.md

How to install Use Case Maker version 2.0.0.3+

Author: davidpodhola

README.md

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 Use Case Maker is a C.A.S.E. tool that helps software developers
 to write organized use cases and to maintain related requirements.
 
+[How to install](https://gist.github.com/davidpodhola/c173dabc552bfbb0196863b064f5809e).
+
 Clone of [Use Case Maker SourceForge repository](http://use-case-maker.sourceforge.net/index.html)
 
 (C) Copyright [Gabriele Gaspardis](https://sourceforge.net/u/gaspardis/profile/)
 
 This repository is maintained by [David Podhola](http://david.podhola.net) (`@davidpodhola`)
+
+![Installation](https://cloud.githubusercontent.com/assets/436605/21646449/8b7e65b2-d296-11e6-9627-281ed29fb7a3.gif)