SimpleFIN Integration Docs (#30933)

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

source/_integrations/simplefin.markdown

@@ -0,0 +1,31 @@
+---
+title: Simplefin
+description: Instructions on the SimpleFIN Integration for personal finance.
+ha_category:
+  - Sensor
+ha_iot_class: Cloud Polling
+ha_release: 2024.8
+ha_codeowners:
+  - '@jeeftor'
+  - '@scottg489'
+ha_domain: simplefin
+ha_config_flow: true
+ha_platforms:
+  - sensor
+ha_dhcp: false
+ha_integration_type: integration
+---
+
+[SimpleFIN](http://simplefin.org) allows users to share read-only financial data. This is a paid service although it is quite affordable ($1.50 a month). 
+
+{% include integrations/config_flow.md %}
+
+
+
+## Setup Guide
+
+Within the SimpleFIN Interface, you can create a **Claim Token**, a one-time token that can be exchanged for an **Access URL**. You can enter either a **Claim Token** or an **Access URL** as a configuration element for this integration. 
+
+### Accounts & Devices
+
+Each financial institution you setup will configured as a **Device** within Home Assistant. And any associated accounts will be linked to these devices.