Add dataset #3

[brunj7]

Need to select and add our dataset #3

Capstone repo: https://github.com/ucsb-ds-capstone-2021/lterdatasets

[brunj7]

Creating the hbr-mapple branch to import the student data and vignette

[brunj7]

• Added the original data and vignette
• Updated the README
• Added broom example (tidy)
• Added more explanations

Maybe adding linear regression on groups?

[allisonhorst]

Ah bummer I didn't see that you had already done this, sorry. Anyway pushed a branch with some edits in it, not sure if it's worth merging those in your just using your version (you'll probably want to reject my merge) but maybe worth looking at to see how our examples & edits align

[allisonhorst]

* Added the original data and vignette

* Updated the README

* Added broom example (tidy)

* Added more explanations

Maybe adding linear regression on groups?

• I think adding a broom::tidy() example is a great idea for the t-test output.
• I don't think we need to actually do the regression here, just showing the graphs is good enough

[brunj7]

merged your version and updated with broom example and header level.