Update README.md

Author: atc1441

README.md

@@ -4,7 +4,7 @@ This core is edited for the D6 Fitness Tracker, it is original from here https:/
 
 This is the Installable version of the Portable version shown in this Video:
 (Click on the Picture to watch the Video)
-[![IMAGE ALT TEXT HERE](https://img.youtube.com/vi/3gjmEdEDJ5A/0.jpg)](https://www.youtube.com/watch?v=3gjmEdEDJ5A)
+[![YoutubeVideo](https://img.youtube.com/vi/3gjmEdEDJ5A/0.jpg)](https://www.youtube.com/watch?v=3gjmEdEDJ5A)
 
 After installation the Core works as in the Video