This changeset makes a few adjustments to our sandbox environment config to make the sandbox deployments of the API much easier. It does this with the following:
* Adds a few environment variable values to the sandbox.yml file to cover the ones that were not there previously
* Adds a new script that can be run in place of memorizing any commands
* Adds documentation on how to configure and run the sandbox environment
Signed-off-by: Carlo Costino <carlo.costino@gsa.gov>