Added reference to Crocks ADT library

crocks is a collection of popular Algebraic Data Types (ADTs) that are all the rage in functional programming. The main goal of crocks is to curate and provide not only a common interface between each type (where possible of course), but also provide all of the helper functions needed to hit the ground running.

Author: dalefrancis88

readme.md

@@ -921,6 +921,7 @@ getNestedPrice({item: {price: 9.99}}) // Some(9.99)
 * [maryamyriameliamurphies.js](https://github.com/sjsyrek/maryamyriameliamurphies.js)
 * [Haskell in ES6](https://github.com/casualjavascript/haskell-in-es6)
 * [Sanctuary](https://github.com/sanctuary-js/sanctuary)
+* [Crocks](https://github.com/evilsoft/crocks)
 
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