Add Intellifire Gas Fireplace integration (#21092)

Co-authored-by: Franck Nijhof <frenck@frenck.nl>

source/_integrations/intellifire.markdown

@@ -0,0 +1,29 @@
+---
+title: IntelliFire
+description: Instructions on the IntelliFire Fireplace integration for Home Assistant.
+ha_category:
+  - Binary Sensor
+ha_iot_class: Local Polling
+ha_release: 2022.2
+ha_codeowners:
+  - '@jeeftor'
+ha_domain: intellifire
+ha_config_flow: true
+---
+
+IntelliFire Wi-Fi fireplace modules provide app-based and Alexa control to various fireplaces. The modules do expose an unencrypted HTTP endpoint on the network that provides status information. This integration will read that URL and create a set of sensors displaying the current fireplace state.
+
+{% include integrations/config_flow.md %}
+
+
+### Sensor Types
+
+
+The following sensors are available as either a **Binary Sensor** when dealing with on/off.
+
+### Binary Sensors
+
+- **Power Sensor**: Whether the fire is on.
+- **Pilot Light Sensor**: Whether the pilot light is turned on.
+- **Timer Sensor**: Whether the sleep timer is turned on.
+- **Thermostat Sensor**: Whether the thermostat is turned on.