added codepen link for first README example

Having a codepen to play around with right away, without having to waste 1-10 minutes (depending on experience) can be a blessing!
reduxjs · Sep 18, 2017 · 0512243 · 0512243
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diff --git a/README.md b/README.md
@@ -9,6 +9,8 @@ Simple “selector” library for Redux inspired by getters in [NuclearJS](https
 * Selectors are efficient. A selector is not recomputed unless one of its arguments change.
 * Selectors are composable. They can be used as input to other selectors.
 
+You can play around with the following **example** in [this codepen](https://codepen.io/Domiii/pen/LzGNWj?editors=0010):
+
 ```js
 import { createSelector } from 'reselect'