README.md: Add HACS magic link (#27)

README.md

@@ -22,6 +22,8 @@ Platform | Description
 
 ## Installation
 
+[![Open your Home Assistant instance and open a repository inside the Home Assistant Community Store.](https://my.home-assistant.io/badges/hacs_repository.svg)](https://my.home-assistant.io/redirect/hacs_repository/?owner=jesserockz&repository=ha-leafspy&category=integration)
+
 1. Using the tool of choice open the directory (folder) for your HA configuration (where you find `configuration.yaml`).
 2. If you do not have a `custom_components` directory (folder) there, you need to create it.
 3. In the `custom_components` directory (folder) create a new folder called `leafspy`.