Add Node-RED (#2111)

Co-authored-by: Sindre Sorhus <sindresorhus@gmail.com>

readme.md

@@ -215,6 +215,7 @@
 - [DOS](https://github.com/balintkissdev/awesome-dos#readme) - Operating system for x86-based personal computers that was popular during the 1980s and early 1990s.
 - [Nix](https://github.com/nix-community/awesome-nix#readme) - Package manager for Linux and other Unix systems that makes package management reliable and reproducible.
 - [Integration](https://github.com/stn1slv/awesome-integration#readme) - Linking together different IT systems (components) to functionally cooperate as a whole.
+- [Node-RED](https://github.com/naimo84/awesome-nodered#readme) - A programming tool for wiring together hardware devices, APIs, and online services.
 
 ## Programming Languages