Create basic install script for dev env

[Igor Santos]

We should run the following commands from the Docker build, but we are unable since the dev machine has no code inside it. Thus, we should have a handy (php/artisan?) script to be run every time we're setting up the dev environment:

RUN chmod -R 777 storage bootstrap/cache
RUN composer install
RUN mv .env.example .env
RUN php artisan key:generate