Update README.md

Author: morewings

README.md

@@ -11,6 +11,7 @@
 [css-vars-hook](https://github.com/morewings/css-vars-hook) contains React hooks to set and manipulate CSS custom properties from React component.
 
 [Demo](https://morewings.github.io/css-vars-hook/)
+[dev.to article](https://dev.to/morewings/how-to-use-css-vars-hook-to-manipulate-css-custom-properties-in-react-38dg)
 
 ## Install