This repository is a companion to the article that can be found @ http://t73.biz/#/cakephp-3-maintenance-mode
git clone https://github.com/t73biz/cakephp-maintenance-mode-tutorial.git
Go into the directory from the command line, and run composer. Details for installing composer can be found @ https://getcomposer.org/
composer install
Once that is finished, you can start a local server running by the command
bin/cake server
This will start an instance of the server and you can view it by default by going to http://localhost:8765/