Create circuit.markdown (#13584)

source/_integrations/circuit.markdown

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+---
+title: Unify Circuit
+description: Instructions on how to send a notification to a Unify Circuit Conversation.
+ha_category:
+  - Notifications
+ha_release: 0.111
+ha_codeowners:
+  - '@braam'
+ha_domain: circuit
+---
+
+The `Unify Circuit` platform allows you to send notifications from Home Assistant to a conversation in [Unify Circuit](https://www.circuit.com/).
+
+## Setup
+
+To send a notification to Circuit, you need to add the Incoming Webhook app to your conversation. When the app is added, you will receive a webhook URL that needs to be added to your `configuration.yaml`.
+
+More details for creating the webhook app, visit: [Create webhook Circuit](https://www.circuit.com/unifyportalfaqdetail?articleId=164448)
+
+## Configuration
+
+To add the Unify Circuit platform to your installation, add the following to your `configuration.yaml` file:
+
+```yaml
+circuit:
+  webhook:
+    - name: circuit_hass
+      url: https://eu.yourcircuit.com/rest/v2/webhooks/incoming/<ID>
+```
+
+{% configuration %}
+name:
+  description: Setting this parameter allows multiple notifiers to be created. The notifier will bind to the service `notify.NOTIFIER_NAME`.
+  required: false
+  type: string
+  default: "notify"
+url:
+  description: The webhook URL created in the setup step.
+  required: true
+  type: string
+{% endconfiguration %}
+
+### Unify circuit notify message
+
+HTML tags can be placed inside `message` for extended functionality.
+
+Example for message:
+
+```yaml
+message: <b>Message</b> that will be added.
+```