Write up summary of the Google Design sprint

[iteles]

[x] MD file to be linked here once @iteles has reviewed

We often talk about Google Design sprints and next year we will have some projects that allow us to exercise this muscle.
I would ideally like to include a little bullet point summary of this in our proposals.

Whereas this will eventually be backed up by videos, for now, some research and a summary of this process would be a fantastic starting point.

[rub1e]

The Google Design Sprint process is outlined here: https://github.com/dwyl/process-handbook/blob/master/google-design-sprint.md

[iteles]

Great job @rub1e, thank you! Feeling all kinds of happy that tasks are being zipped through so quickly ❤️