Documentation for Risco integration (#14286)

* Docs for risco integration

* Add link to Risco cloud

source/_integrations/risco.markdown

@@ -0,0 +1,30 @@
+---
+title: Risco Alarm
+description: Instructions on how to integrate Risco alarms into HA using Risco Cloud.
+ha_category:
+  - Alarm
+ha_release: "0.115"
+ha_iot_class: Cloud Polling
+ha_config_flow: true
+ha_codeowners:
+  - "@OnFreund"
+ha_domain: risco
+---
+
+This integration connects with Risco Alarms over [Risco Cloud](https://riscocloud.com/).
+
+## Configuration
+
+This integration can be configured using the integrations panel in the
+Home Assistant frontend.
+
+Menu: **Configuration** -> **Integrations**.
+
+Click on the `+` sign to add an integration and click on **Risco**.
+You will be prompted for your username, password, and pin code (you can create a specific user for this purpose).
+An Alarm Control Panel entity will be created for each partition in your site.
+
+If you have multiple sites, only the first site will be used.
+
+Currently supported plaforms:
+- [Alarm Control Panel](/integrations/alarm_control_panel/)