Update README.md

Author: jhades

README.md

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 This repository contains the full application of the course Angular and Firebase - Build a Web Application, so this contains the complete application like it will look like at the end of the course. 
 
+![Angular firebase course](https://angular-academy.s3.amazonaws.com/thumbnails/angular_app-firebase-small.jpg)
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 # Looking for the course starting repo ? 
 
 If you are looking for a clean starting point for coding along as you follow the course, please check this [repository](https://github.com/angular-university/angular-firebase-app-starter) instead.