Adding 2nd edition translations (spanish) (#1711)

* Adding 2nd edition translations (spanish)

* Update link

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Co-authored-by: Mine Cetinkaya-Rundel <cetinkaya.mine@gmail.com>

Author: davidrsch

index.qmd

@@ -20,6 +20,10 @@ If you speak another language, you might be interested in the freely available t
 -   [Turkish](https://tr.r4ds.hadley.nz)
 -   [Portuguese](https://pt.r4ds.hadley.nz)
 
+and 2nd edition
+
+-   [Spanish](https://davidrsch.github.io/r4ds-es/)
+
 You can find suggested answers to exercises in the book at <https://mine-cetinkaya-rundel.github.io/r4ds-solutions>.
 
 Please note that R4DS uses a [Contributor Code of Conduct](https://contributor-covenant.org/version/2/0/CODE_OF_CONDUCT.html).