Added JSDoc description

ghost/job-manager/lib/job-manager.js

@@ -24,6 +24,12 @@ class JobManager {
         this.logging = logging;
     }
 
+    /**
+     * Adds job to queue
+     *
+     * @param {Function} job function to be executed in the queue
+     * @param {Object} [data] data to be passed into the job
+     */
     addJob(job, data) {
         this.queue.push(async () => {
             await job(data);