Update README.md

Add demo

Author: soufiane-fadil

README.md

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 This project was generated with [Angular CLI](https://github.com/angular/angular-cli) version 8.0.4.
 
+# Demo 
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+![image](https://user-images.githubusercontent.com/4992012/68629236-59dd8b00-04e3-11ea-85f1-cc42419d4949.png)
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 ## Development server
 
 Run `ng serve` for a dev server. Navigate to `http://localhost:4200/`. The app will automatically reload if you change any of the source files.