Add documentation link

README.md

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 This project provides a comprehensive Python-based solution for managing and synchronizing financial data between Kresus - a personal finance management tool, and Firefly III - an open-source personal finance manager. It's designed to streamline the process of financial data handling, offering seamless integration and data synchronization capabilities.
 
+A python documentaion is available [here](https://alanjumeaucourt.github.io/firefly-iii-synchro/)
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 ## Features
 Firefly III API Integration: Utilizes a custom-built wrapper around the Firefly III API, enabling efficient interactions such as fetching, creating, updating, and deleting financial records.