Add new integration nexia (#12376)

* Add documentation for nexia

* Add missing catagories

* Update source/_integrations/nexia.markdown

Co-Authored-By: Franck Nijhof <git@frenck.dev>

* Update source/_integrations/nexia.markdown

Co-Authored-By: Franck Nijhof <git@frenck.dev>

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

source/_integrations/nexia.markdown

@@ -0,0 +1,76 @@
+---
+title: Nexia
+description: Instructions on how to integrate Nexia Thermostats (Trane/American Standard) into Home Assistant.
+ha_category:
+  - Binary Sensor
+  - Sensor
+  - Climate
+ha_release: 0.108
+ha_iot_class: Cloud Polling
+ha_config_flow: true
+ha_codeowners:
+  - '@bdraco'
+  - '@ryannazaretian'
+ha_domain: nexia
+---
+
+The `nexia` integration allows you to integrate your [Nexia](https://mynexia.com/) thermostats into Home Assistant.
+
+There is currently support for the following device types within Home Assistant:
+
+- [Binary Sensor](#binary-sensor)
+- [Climate](#climate)
+- [Sensor](#sensor)
+
+## Configuration
+
+You will need your mynexia.com username and password to use this module.
+
+To add `Nexia` to your installation, go to **Configuration** >> **Integrations** in the UI, click the button with `+` sign and from the list of integrations select **Nexia**.
+
+Alternatively, add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+nexia:
+  username: YOUR_NEXIA_USERNAME
+  password: YOUR_NEXIA_PASSWORD
+```
+
+{% configuration %}
+username:
+  description: The username for accessing your Nexia account.
+  required: true
+  type: string
+password:
+  description: The password for accessing your Nexia account.
+  required: true
+  type: string
+{% endconfiguration %}
+
+### Binary Sensor
+
+The following binary sensors are added for each thermostat:
+
+- Blower Active
+
+### Sensor
+
+The following binary sensors are added for each thermostat:
+
+- Air Cleaner Mode
+- Current Compressor Speed
+- Requested Compressor Speed
+- Outdoor Temperature
+- Relative Humidity
+- System Status
+
+The following binary sensors are added for each thermostat zone:
+
+- Zone Temperature
+- Zone Setpoint Status
+- Zone Status
+
+### Climate
+
+The `nexia` climate platform lets you control a thermostat.