* added Rstudio cheatsheets.

R/20220621.Rstudio-cheatsheets.md

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+Cheatsheets from RStudio
+========================
+
+RStudio offers a lot of cheatsheets for various tools, methods.
+Check them out here:
+
+https://www.rstudio.com/resources/cheatsheets/
+
+Some notable ones (samples):
+
+* "Data visualization with ggplot2 cheatsheet"
+  https://raw.githubusercontent.com/rstudio/cheatsheets/main/data-visualization.pdf
+
+
+* "Data transformation with dplyr cheatsheet"
+  https://raw.githubusercontent.com/rstudio/cheatsheets/main/data-transformation.pdf
+
+* "Base R cheatsheet" (contributed, Mhairi McNeill)
+  https://raw.githubusercontent.com/rstudio/cheatsheets/main/base-r.pdf
+  http://github.com/rstudio/cheatsheets/blob/main/base-r.pdf
+
+* "Advanced R cheatsheet" (contributed, Arianne Colton and Sean Chen)
+  https://www.rstudio.com/wp-content/uploads/2016/02/advancedR.pdf