Document how to build the image from scratch

[Ramblurr]

Is your feature request related to a problem? Please describe.
I would like to build the mycroft-dinkum sandbox image from scratch.

Describe the solution you'd like
I would like to see a set of scripts and documentation for building the dinkum sandbox image from the git repo.

Describe alternatives you've considered
n/a

Additional context
n/a

[krisgesling]

Hey there,

You can find the Sandbox build scripts here:
https://github.com/MycroftAI/mark-ii-sandbox

There's a makefile and the readme contains instructions for producing the different Sandbox images.

[Ramblurr]

Ah, amazing thanks!