Update main.sh to allow for user options

[VictorMotogna]

Use shell_scripts/multi_chooser.sh function to allow the user to select from the benchmarks which ones they would like to run.

Initially, they could choose only between csv parser and none.

If csv parser is selected, execute:

echo '---------------'
echo 'Running csv parser'
chmod 755 shell_scripts/csv_parser.sh
source shell_scripts/csv_parser.sh

If none is selected, execute:

echo '---------------'
echo 'Thanks for stopping by! See you next time.'

[codrutzu]

I'm assigning myself to this