Add observable notebook

Evercoder · Apr 19, 2018 · 12220b4 · 12220b4
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 # d3-color-difference
 
+See this [Observable notebook](https://beta.observablehq.com/@danburzo/color-difference-formulas-with-d3-color-difference).
+
 ## Installing
 
+```bash
+$ npm install d3-color-difference
+```
+
 ## API Reference
 
 ### Euclidean Distances