docs(readme): add Leon personal assistant

README.md

@@ -164,6 +164,7 @@ Some [Content Management System](#content-management-systems-cms) solutions also
 - [Http2pic](https://http2pic.haschek.at/) - Website screenshots/renderer. It uses the wkhtmltox to render websites with various options. ([Source Code](https://github.com/chrisiaut/http2pic)) `Apache 2.0` `PHP/Javascript`
 - [Kibitzr](https://kibitzr.github.io) - Lightweight personal web assistant with powerful integrations. ([Source Code](https://github.com/kibitzr/kibitzr/)) `MIT` `Python`
 - [LazyLibrarian](https://github.com/DobyTang/LazyLibrarian) `⚠` - LazyLibrarian is a program to follow authors and grab metadata for all your digital reading needs. It uses a combination of Goodreads Librarything and optionally GoogleBooks as sources for author info and book info. `GPL-3.0` `Python`
+- [Leon](https://getleon.ai) - Open-source personal assistant who can live on your server. ([Demo](https://www.youtube.com/watch?v=p7GRGiicO1c), [Source Code](https://github.com/leon-ai/leon)) `MIT` `Node.js`
 - [Lidarr](https://lidarr.audio/) - Lidarr is a music collection manager for Usenet and BitTorrent users. ([Source Code](https://github.com/Lidarr/Lidarr)) `GPL-3.0` `C#`
 - [Medusa](https://github.com/pymedusa/SickRage) - Automatic Video Library Manager for TV Shows. It watches for new episodes of your favorite shows, and when they are posted it does its magic. `GPL-3.0` `Python`
 - [Node RED](http://nodered.org/) - Browser-based flow editor that helps you wiring hardware devices, APIs and online services to create IoT solutions. ([Source Code](https://github.com/node-red/node-red)) `Apache-2.0` `Nodejs`