Added install instructions for integration

README.md

@@ -1,5 +1,5 @@
 # hassio-bluetti-bt
-[![hacs_badge](https://img.shields.io/badge/HACS-Custom-41BDF5.svg)](https://github.com/hacs/integration)
+[![hacs_badge](https://img.shields.io/badge/HACS-Default-41BDF5.svg)](https://github.com/hacs/integration)
 [![Validate with hassfest](https://github.com/Patrick762/hassio-bluetti-bt/actions/workflows/hassfest_validation.yml/badge.svg)](https://github.com/Patrick762/hassio-bluetti-bt/actions/workflows/hassfest_validation.yml)
 [![HACS Action](https://github.com/Patrick762/hassio-bluetti-bt/actions/workflows/HACS.yml/badge.svg)](https://github.com/Patrick762/hassio-bluetti-bt/actions/workflows/HACS.yml)
 
@@ -7,6 +7,12 @@ Bluetti Integration for Home Assistant
 
 Based on [bluetti_mqtt](https://github.com/warhammerkid/bluetti_mqtt).
 
+## Installation
+To install this integration, you first need [HACS](https://hacs.xyz/) installed.
+After the installation, you can use this button to install the integration:
+
+[![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=Patrick762&repository=hassio-bluetti-bt&category=integration)
+
 ### Supported devices:
 (based on [supported devices of bluetti_mqtt](https://github.com/warhammerkid/bluetti_mqtt/tree/main/bluetti_mqtt/core/devices))