Merge pull request DataScienceSpecialization#51 from startupjing/master

r language cheatsheet

Author: seankross

rprog.md

@@ -11,4 +11,7 @@ permalink: /rprog/
 
 ## R Language
 
-- [Some notes on the R Language](http://lopezrj.github.io)
+- [Some notes on the R Language](http://lopezrj.github.io)
+
+## R language cheatsheet
+- [R cheatsheet covering all lectures](https://github.com/startupjing/Tech_Notes/blob/master/R/R_language.md)