base exercise one directory and README
Merge branch 'master' of github.com:Reproducible-Science-Curriculum/rr-multifile
Version of gapminder data for initial exercise
Merge pull request #2 from kbroman/data4exercises

Version of gapminder data for initial exercise
renamed to reflect the exercise name
Merge branch 'master' of github.com:Reproducible-Science-Curriculum/rr-multifile
added directories and basic README for exercise2 and 3
basic Metadata exercise with questions to ponder