Adding chowdown.io to recipe management (#3540)

* Adding chowdown.io to recipe management
Co-authored-by: nodiscc <nodiscc@gmail.com>

README.md

@@ -1630,6 +1630,7 @@ A [proxy](https://en.wikipedia.org/wiki/Proxy_server) is a server application th
 Software and tools for managing [recipes](https://en.wikipedia.org/wiki/Recipe).
 
 - [Bar Assistant](https://github.com/karlomikus/bar-assistant) - Bar assistant is a self hosted application for managing your home bar. It allows you to add your ingredients, search for cocktails and create custom cocktail recipes. ([Demo](https://bar.karlomikus.com/)) `MIT` `PHP/Docker`
+- [Chowdown.io](https://chowdown.io/) - Simple recipes in Markdown format. ([Source Code](https://github.com/clarklab/chowdown)) `Unlicense` `Ruby`
 - [Groceri.es](https://groceri.es/) - Web-based application to manage your recipes and plan your meals ahead. groceri.es keeps track of your menu plans and generates a groceries list for you. ([Source Code](https://github.com/juriansluiman/groceri.es)) `MIT` `Docker/Python`
 - [kcal](https://github.com/kcal-app/kcal) - Track nutritional information about foods and recipes, set goals, and record a food journal to help along the way. Kcal is a personal system that focuses on direct control of inputs and a minimal, easy to use recipe presentation for preparing meals. `MPL-2.0` `PHP`
 - [KitchenOwl](https://tombursch.github.io/kitchenowl/) - A cross-platform shopping list, recipe storage, expense tracker, and meal planner following the material design language. ([Source Code](https://github.com/TomBursch/kitchenowl)) `AGPL-3.0` `Docker`