Moved virtualbox instructions to its own file.

[saintograph]

Separated instructions from quickstart.md.

[jeamick]

Hi there!

What we can do in order for people to do demos is to create our own OpenMined's VM and people with the use of Virtual just need to download it and use it directly

In France, we have something like this about Ethereum in order to code with some softwares already installed on the VM. Here is the repo : https://github.com/asseth/assethbox

[saintograph]

Great idea @jeamick, a custom .ova could be available as an option.

[cereallarceny]

@winfredselwyn This looks good, but are we referencing it anywhere in the docs? I would request that we provide a link to it somewhere rather than just assume they'll stumble upon this file.

[iamtrask]

Going ahead and merging! I think that this document will help lots of folks - particularly those on older Windows machines which seem to struggle with OM in it's current state. Great contribution @winfredselwyn !!

[saintograph]

Awesome, thanks @iamtrask !