fix: Add missing files and comments to better match the course content #12
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Added SETUP.md with instructions on how to install course materials with brew on MacOS, as brew was used to install some things, but not everything in the course material
Added directories to the .gitignore that were missing
Added spark.stop() commands (for completeness)
Added commented out code blocks that were in the course material and deleted
Added PyCharm IDE Configurations to the .run directory so that the program input isn't missing on run