Add documentation for OneDrive

source/_integrations/onedrive.markdown

@@ -0,0 +1,38 @@
+---
+title: OneDrive
+description: Instructions on how to setup OneDrive to be used with backups.
+ha_release: 2025.2
+ha_category:
+  - Backup
+ha_iot_class: Cloud Polling
+ha_config_flow: true
+ha_domain: onedrive
+ha_codeowners:
+  - '@zweckj'
+ha_integration_type: service
+---
+
+This integration allows you to use [OneDrive](https://www.microsoft.com/en-us/microsoft-365/onedrive/online-cloud-storage) for use with Home Assistant Backups.
+Backups will be created in the `App Folder` of your OneDrive, the integration does have no access to any other parts of your OneDrive except its own folder.
+
+{% include integrations/config_flow.md %}
+
+## Getting application credentials
+
+{% note %}
+You will need an Azure tenant with an active Azure subscription to create your own client credentials.
+{% endnote %}
+
+This integration comes with a predefined set of [application credentials](https://www.home-assistant.io/integrations/application_credentials/) through Home assistant account linking. 
+Everything is done in the user context, so nobody will every have access to your data except you. However, because you want to your own credentials this is possible, 
+follow [this guide](https://learn.microsoft.com/en-us/entra/identity-platform/quickstart-register-app?tabs=certificate) to create your own client ID and secret 
+
+## Known Limitations
+
+- Only personal OneDrives are supported a the moment
+
+## Removing the integration
+
+This integration follows standard integration removal. No extra steps are required.
+
+{% include integrations/remove_device_service.md %}