Discuss best location for result/output files

Several CC@Home2020 participants were keen to learn good practice for where to put results/outputs files (inside or outside 'data' folder?), whether to put them under version control, etc.

The material could be improved by adding discussing this somehwere - maybe episode 1, or maybe later in the lesson if more appropriate. This could include mention of using .gitignore to prevent certain intermediate/results files from being included in the repository e.g. if very large.