Adding Monarch Money docs (#34327)

* Adding Monarch Money docs

* adding finance category

* Update source/_integrations/monarchmoney.markdown

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* Update source/_integrations/monarchmoney.markdown

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

* Updated domain name

* Update source/_integrations/monarch_money.markdown

Co-authored-by: Joost Lekkerkerker <joostlek@outlook.com>

* Apply suggestions from code review

* Update source/_integrations/monarch_money.markdown

* Update source/_integrations/monarch_money.markdown

* Update source/_integrations/monarch_money.markdown

* Update source/_integrations/monarch_money.markdown

---------

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>
Co-authored-by: Joost Lekkerkerker <joostlek@outlook.com>
Co-authored-by: c0ffeeca7 <38767475+c0ffeeca7@users.noreply.github.com>

source/_integrations/monarch_money.markdown

@@ -0,0 +1,34 @@
+---
+title: Monarch Money
+description: Instructions on the Monarch Money Integration for personal finance.
+ha_category:
+  - Sensor
+  - Finance
+ha_iot_class: Cloud Polling
+ha_release: "2024.10"
+ha_codeowners:
+  - '@jeeftor'
+ha_domain: monarch_money
+ha_config_flow: true
+ha_platforms:
+  - sensor
+ha_integration_type: service
+---
+
+[Monarch Money](https://www.monarchmoney.com) is a personal finance aggregation and budgeting service that integrates with Plaid, MX, and FinCity, the three major financial backends.
+
+## Prerequisites
+
+- You need a Monarch Money account to use this integration.
+- You need account credentials. This integration supports both `username` and `password` login, as well as accounts configured with `MFA`.
+
+{% include integrations/config_flow.md %}
+
+### Accounts & devices
+
+Each `account` is set up as a device in Home Assistant and contain the following sensors:
+
+|Sensor|Description|
+|-------|---------------|
+|Balance|Account balance|
+|Age| This sensor shows when the data was retrieved by Monarch's back end |