Doc: [cronjob manager] Doc for implementing cronjob

src/Bundle/ChillMainBundle/Cron/CronManagerInterface.php

@@ -13,5 +13,11 @@ namespace Chill\MainBundle\Cron;
 
 interface CronManagerInterface
 {
+    /**
+     * Execute one job, with a given priority, or the given job (identified by his key)
+     *
+     * @param string|null $forceJob
+     * @return void
+     */
     public function run(?string $forceJob = null): void;
 }