add link to Shiny simulation tutorial

The Tutorial is an interactive R Markdown document, currently hosted on shinyapps.io.  It aims to take the reader step-by-step through the construction of a reasonably full-featured simulation app that lets statistics students explore, through simulation, the coverage properties of the classical t-intervals for a population mean.  After completing the tutorial the reader will be able to write his/her own simulation apps---hopefully having been spared some of the struggle that I went through when I first learned Shiny in the Spring of 2014.

Author: homerhanumat

ddp.md

@@ -8,6 +8,7 @@ permalink: /ddp/
 - [ggvis and rmarkdown slides with interactive plots](http://qua.st/ggvis-shiny-html5-slides/)
 - [Shiny app to simulate 401K growth with interactive plots](http://www.mephistosoftware.com/shiny/401k_simulator/)
 - [Shiny Video Tutorials Playlist on Youtube](http://www.youtube.com/playlist?list=PL6wLL_RojB5xNOhe2OTSd-DPkMLVY9DfB)
+- [Tutorial on writing Shiny simulation apps](http://homer.shinyapps.io/sim_tutorial_Rmd)
 
 ## Comprehensive Notes