Update README.md

Linking medium article

Author: Raúl Gómez Acuña

README.md

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 [Android Palette API](https://developer.android.com/training/material/palette-colors.html) brought to react native. It extracts prominent colors from images to help you create visually engaging apps. At the moment it only supports Android.
 
+Check out [this medium article](https://blog.callstack.io/colour-your-apps-in-react-native-using-material-palette-35448df91958) for a broader introduction!
+
 ## Installation
 
 Installation and setup guide can be found here: [Setup guide](./docs/SETUP.md).