Merge pull request valentinogagliardi#92 from IgnaciodeNuevo/patch-58

Added CSS Grid Generator Tool

Author: valentinogagliardi

README.md

@@ -114,6 +114,7 @@ Simmons)](http://jensimmons.com/post/feb-28-2017/benefits-learning-how-code-layo
 * [Announcing CSS Grid & the Firefox Grid Inspector Tool](https://www.youtube.com/watch?v=16enLRDbOyY)
 * [CSS Grid Cheat Sheet](https://alialaa.github.io/css-grid-cheat-sheet/) - Another CSS Grid Tool, by Ali Alaa
 * [CSS Grid Garden](http://cssgridgarden.com/) - A game for learning CSS Grid
+* [CSS Grid Generator](https://www.layoutit.com/grid)
 * [CSS Grid Playground by Mozilla](https://mozilladevelopers.github.io/playground/)
 * [CSS Grid Template Builder](http://codepen.io/anthonydugois/full/RpYBmy) - A simple tool to build complex CSS Grid templates
 * [Griddy](http://griddy.io) - A nice tool to experiment with CSS Grid Layout