Add reposority setup instructions to the README (#14)

README.md

@@ -2,6 +2,14 @@
 
 A repository of Grafana-related Add-ons for Home Assistant
 
+## Setup
+
+Click the button below to add this addon repository to your Home Assistant.
+
+[![Add repository on my Home Assistant][repository-badge]][repository-url]
+
+If you want to do add the repository manually, please follow the procedure highlighted in the [Home Assistant website](https://home-assistant.io/hassio/installing_third_party_addons). Use the following URL to add this repository: https://github.com/grafana/home-assistant-addons
+
 ## Add-ons
 
 This repository contains the following add-ons
@@ -11,3 +19,5 @@ This repository contains the following add-ons
 Easily export Home Assistant stats to Grafana Cloud
 
 [grafana]: https://grafana.com
+[repository-badge]: https://img.shields.io/badge/Add%20repository%20to%20my-Home%20Assistant-41BDF5?logo=home-assistant&style=for-the-badge
+[repository-url]: https://my.home-assistant.io/redirect/supervisor_add_addon_repository/?repository_url=https%3A%2F%2Fgithub.heygears.com%2Fgrafana%2Fhome-assistant-addons