Add ideas and resources for varying skill levels

Add resources and project ideas for folks of varying skill levels.

This can go on a separate canvas page than the syllabus, but be linked from it.

Make it question-based, choose your own adventure style, in stages.

Foundation: git, programming scripts, shell, tidy tabular data.

A little experience: xgboost, scaling workflows with hpc, ...

Some experience: deep learning, ...