Update README.md

Author: KTibow

README.md

@@ -1,3 +1,10 @@
-# fullscreen-card
+# fullscreen-card [![hacs_badge](https://img.shields.io/badge/custom%20repo%20on-hacs-%2303a9f4.svg?style=flat-square)](https://hacs.xyz/)
 Make your Home Assistant browser fullscreen.  
 ![Screenshot](/fscreen.png)  
+## install it
+Make sure [hacs](https://hacs.xyz/) is installed.  
+Then add this repo as a custom repository.  
+Then refresh your browser tab.  
+Then add the custom card to your dashboard.  
+Then click on ![go](https://img.shields.io/badge/-Go-%23888888.svg?style=flat-square).  
+Then you're ![done](https://img.shields.io/badge/-done-green.svg?style=flat-square).