Add instructions to setup Git

[segalm99]

You may want to add instructions to setup Git after installation for Lab 3.

For example if you don't have an ssh key setup for your git account you will get a permission denied error when you tor to clone the bootcamp repository

git clone git@github.com:devsecops/bootcamp.git

You can follow the steps described here,

https://gist.github.com/adamjohnson/5682757

to resolve.

[slietz]

Good point. Will get that going.