update readme

Author: GregorBiswanger

README.md

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-# Electron.NET API Demos
+# <img src="https://cloud.githubusercontent.com/assets/378023/15172388/b2b81950-1790-11e6-9a7c-ccc39912bb3a.png" width="60px" align="center" alt="Electron.NET API Demos icon"> Electron.NET API Demos  
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 This is a desktop app that interactively and with sample code demonstrates core features of the [Electron.NET](https://github.com/ElectronNET/Electron.NET) API. It's built with Electron, too, of course. This app works on Windows, macOS and Linux operating systems.  
 
 Use this app to see what you can do with Electron.NET and use the source code to learn how to create a basic Electron.NET app.  
 
 This Demo-App based on the [Electron API Demos](https://github.com/electron/electron-api-demos)  
 
+  ![Electron.NET API Demos](https://github.com/ElectronNET/electron.net-api-demos/blob/master/ElectronNET-API-Demos/wwwroot/assets/img/about.png)
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 ## Using