add code to generate tickets by violation graphic

add code to generate tickets by day-of-week graphic

add code to generate tickets issued by day of month

add code to generate tickets per month figure

add code to generate tickets grouped by year

add simple script to parse csv files

I was given 40 csv files totaling 13,023,114 tickets issued between
January 1st 2011 and December 31st 2020.

add conda environment file

hey, look over there!