Add command to display Kanboard version

app/Console/VersionCommand.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace Kanboard\Console;
+
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+/**
+ * Class VersionCommand
+ *
+ * @package Kanboard\Console
+ * @author  Frederic Guillot
+ */
+class VersionCommand extends BaseCommand
+{
+    protected function configure()
+    {
+        $this
+            ->setName('version')
+            ->setDescription('Display Kanboard version')
+        ;
+    }
+
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        $output->writeln(APP_VERSION);
+    }
+}

app/ServiceProvider/CommandProvider.php

@@ -20,6 +20,7 @@ use Kanboard\Console\TaskExportCommand;
 use Kanboard\Console\TaskOverdueNotificationCommand;
 use Kanboard\Console\TaskTriggerCommand;
 use Kanboard\Console\TransitionExportCommand;
+use Kanboard\Console\VersionCommand;
 use Kanboard\Console\WorkerCommand;
 use Pimple\Container;
 use Pimple\ServiceProviderInterface;
@@ -61,6 +62,7 @@ class CommandProvider implements ServiceProviderInterface
         $application->add(new PluginUninstallCommand($container));
         $application->add(new DatabaseMigrationCommand($container));
         $application->add(new DatabaseVersionCommand($container));
+        $application->add(new VersionCommand($container));
 
         $container['cli'] = $application;
         return $container;