Update README.md

README.md

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 A dekstop application for Threema.
 
-![Threema Dekstop Application]()
+![ThreemaDekstopApplication](https://raw.githubusercontent.com/callFEELD/Threema-Desktop/master/docs/img/Threema-Desktop-Application.jpg?token=AGCZAMFQFG3NND44SVPAEMS6FC4XY)
 
 This application is showing the website [Threema Web](https://web.threema.ch/).
 All the traffic runs through the threema website.
 
 The application adds a Taskbar Tray, just like the application whatsapp and telegram dekstop. When you click on exit, the program won't shutdown. It will minimize to the Taskbar Tray (Just like other apps i.e. discord, skype, telegram desktop). You can close threema dekstop by rightclicking the Taskbar Tray and click on close.
 
-![Threema Dekstop Taskbar Tray]()
+![ThreemaDekstopTaskbarTray](https://raw.githubusercontent.com/callFEELD/Threema-Desktop/master/docs/img/Threema-Desktop-Taskbar-Tray.jpg?token=AGCZAMHAT4M7GC7IZWTBDM26FC4ZU)
 
 
-The application alter some CSS styling ([visible here]()).
+The application alter some CSS styling ([visible here](https://github.com/callFEELD/Threema-Desktop/blob/master/assets/css/override.css)).