Ensure require is present in composer.json. This will install the plugin into Plugin/GitHub:
{
    "require": {
        "cvo-technologies/cakephp-github": "~1.1"
    }
}If you want to get information about a specific repository
Add the following to the Webservice section of your application config.
        'git_hub' => [
            'className' => 'Muffin\Webservice\Connection',
            'service' => 'CvoTechnologies/GitHub.GitHub',
        ]
<?php
namespace CvoTechnologies\GitHub\Controller;
use Cake\Controller\Controller;
use Cake\Event\Event;
class IssuesController extends Controller
{
    public function beforeFilter(Event $event)
    {
        $this->loadModel('CvoTechnologies/GitHub.Issues', 'Endpoint');
    }
    public function index()
    {
        $issues = $this->Issues->find()->where([
            'owner' => 'cakephp',
            'repo' => 'cakephp'
        ]);
        $this->set('issues', $issues);
    }
}