Commits
François Saint-Jacques authored and Wes McKinney committed 7a495e7800e
ARROW-3824: [R] Add basic build and test documentation Author: François Saint-Jacques <fsaintjacques@gmail.com> Closes #3967 from fsaintjacques/ARROW-3824-R-build-test-documentation and squashes the following commits: 8ea595b1f <François Saint-Jacques> ARROW-3824: Add basic build and test documentation