Add a more complete database sample.

This includes a place holder for database username, to ease the life when someone wants to automate the copying of it to the final path in the dev machine.
Add a sample file for .env variables.
Add a maroto script for setting up the environment first time.

But wait! It can be run at any time in the project. This is great for test new additions to it, or even to update the whole dev environment if you need it.

You can use the flag -s when running it to skip the database creation and migration. Just because this can take time. If you know that you databases are up to date, feel free to use this flag.
Add documentation for the setup script
Merge pull request #56 from ricardovaleriano/setup

Setup Script