Created installation script and installation command

bin/install

@@ -0,0 +1,11 @@
+#!/usr/bin/env php
+<?php
+use Shlinkio\Shlink\CLI\Command\Install\InstallCommand;
+use Symfony\Component\Console\Application;
+
+require __DIR__ . '/../vendor/autoload.php';
+
+$app = new Application();
+$app->add(new InstallCommand());
+$app->setDefaultCommand('shlink:install');
+$app->run();