Add content for keep app running in node.js (#2424)

* Update readme.md

* Update content/roadmaps/107-nodejs/content/108-nodejs-keep-app-running/readme.md

Co-authored-by: Kamran Ahmed <kamranahmed.se@gmail.com>

content/roadmaps/107-nodejs/content/108-nodejs-keep-app-running/readme.md

@@ -1 +1,3 @@
-# Nodejs keep app running
+# Keep App Running
+
+In Node.js, you need to restart the process to make changes take effect. This adds an extra step to your workflow. You can eliminate this extra step by using `nodemon` to restart the process automatically.