add tutorial notebook

[cdonnay]

Add a getting_started tutorial notebook, as well as adding Minneapolis Mayor 2013 data to data folder so that users can have access to it.

@jamesturk @drdeford @jgibson517 @ziglaser @jennjwang

[cdonnay]

Needs to be merged after pull request #96 to allow for choice of columns in a csv file.

[jgibson517]

hi @cdonnay, thanks so much for the help on this, the tutorial notebook is amazing!!! i'd love to add it to the documentation site as well if that's ok with you!

my only comment is on adding the Minneapolis data to the repo. one, there's a similar file at tests/data/mn_clean_ballots.csv and let's try and avoid adding larger csv files to the repo so isn't to large to easily clone for future contributors (a previous version of this package suffered from that..). i'd suggest swapping the existing MN csv file with the one your using, since we'll want to test the rank_columns args and/or linking where you downloaded the file in the notebook so users can easily download it themselves!

[cdonnay]

@jgibson517 Adding it to the documentation site would be great. I removed the csv file I added and now just point people to the mn_clean_ballots file instead. I also edited the notebook to account for the new csv file.

In that file, do you know what an overvote and what an undervote is?

[cdonnay]

@jgibson517 not sure why my second commit is failing the 3.11 tests, particularly since the test it's failing is not related to any code I edited for this pull. But I'm new to git so totally possible that it's a me error.

[jgibson517]

since the test_interval_from_params is based on a probability distribution, it'll occasionally fail (its not ideal and a better test is on the to-do list). if you go to details and click re-run jobs, they should pass 🤞

[cdonnay]

@jgibson517 for some reason it isn't showing me a re-run option for the job.

[jgibson517]

hm must be a github user permission setting, I re-ran it from my end so should be all set!