This pull request introduces a custom add-ons area, including documentation, licensing files, and an account three-way matching add-on with translation resources. This may expand accounting-related capabilities, but the provided description does not explain the exact business workflow changes.

Description of the issue/feature this PR addresses:

Current behavior before PR:

Desired behavior after PR is merged:




---
I confirm I have signed the CLA and read the PR guidelines at www.odoo.com/submit-pr