Update README.md

Author: Ali-YousefiTelori

README.md

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 # SignalGoTest
+To download application go to [![Release](https://img.shields.io/badge/SignalGoTest-Download-brightgreen.svg)](https://github.com/SignalGo/SignalGoTest/releases) page
 with this project you can test your signal go servers with an windows application like wcf test service,this application help you call your server methods without write any code.
 ![ScreenShot](/../master/image2.png "sample image")