🗒 Update readme

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README.md

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 # heishamon-homeassistant
 
-An integration for heatpumps handled by heishamon.
+An integration for heatpumps handled by [heishamon](https://github.com/Egyras/HeishaMon).
+It's currently in development, expect sensors to be renamed.
 
-This integration should be installed with hacs as a custom repository.
-It's currently in development.
+## Installation
+Installation should be done using https://hacs.xyz/ as a custom repository.
+
+## Configuration
+
+Just make sure you have an MQTT integration configured. Heishamon mqtt messages should quickly lead to auto-discovery.
+
+## Alternatives
+
+If you own Panasonic CZ-TAW1 module and have access to Panasonic smart cloud: use https://github.com/cjaliaga/home-assistant-aquarea or https://github.com/ronhks/panasonic-aquarea-smart-cloud-mqtt.