Simple note for github vs. Rstudio

Having used both Rstudio and GitHub for a while, but never thought to combine them together. Hadley Wickham already put a detailed instruction on how to link GitHub with Rstudio (http://r-pkgs.had.co.nz/git.html). I just list few quick note from my own experience.

1. The "project" concept of Rstudio is the key. I was not very organized before, very often just working on multiple files from different projects at the same time. Actually it's very distractive. It seems that only files organized into a project can be pushed to GitHub via Rstudio. Very good!

2. How to install R package in private GitHub repo? The trick is here.
## add your PAT (Personal Access Token, get here: https://github.com/settings/tokens) into your ~/.Renviron file
# echo "GITHUB_PAT=xxxxxxxxxxYOUR-PAT-GO-HERExxxxxxxxxx" >> ~/.Renviron
# library(devtools);install_github("sterding/powerEQTL")