add dplyr and r markdown materials

corinne-riddell / SER-tidyverse-2019

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Closed malcolmbarrett closed 5 years ago

malcolmbarrett commented 5 years ago

This PR:

Adds dplyr and R Markdown teaching materials
Adds an exercise folder
Adds a cheatsheet folder w/ cheatsheets for reading data, dplyr, ggplot2, and R Markdown