Update README.md

Author: phagenlocher

README.md

@@ -1,2 +1,12 @@
 # roc-color
-🌈 Library for styling terminal contents with ANSI, 256 bit color and Truecolor 
+🌈 Roc package for styling terminal contents with ANSI, 256 bit color and Truecolor
+
+The interface of this library is heavily influenced by the Haskell package [colourista](https://github.com/kowainik/colourista).
+
+## Usage
+
+The main function to interact with is `formatWith` which accepts a list of attributes and a fore- and background color to format a text with. Check the examples to get a feel for the library!
+
+## Documentation
+
+A more detailed documentation of the exposed functions can be found at: https://phagenlocher.github.io/roc-color/