Run
$ git clone https://github.com/coolms/php-robot-test
to get the project on your machine. This will create a directory called php-robot-test wherever you run the command.
The simplest way to use Toy Robot Coding Puzzle app is to use Docker. If you don't have Docker yet, download it following the instructions on https://www.docker.com/.
In php-robot-test directory just run
$ docker-compose up --build -d
Get into Docker container using
$ docker exec -it robot-php /bin/sh
To start using Toy Robot Coding Puzzle app just run the following command
$ php robot.php
More info on supported commands can be found at Toy Robot Coding Puzzle task page