comprehensive introduction of node js in (100 what is nodejs) (#1811)

* comprehensive introduction of node js in (100 what is nodejs)

* add how nodejs works

* Update content/roadmaps/107-nodejs/content/100-nodejs-introduction/100-what-is-nodejs.md

Co-authored-by: Muhammad Anas <anas.s@automatedbusiness.solutions>
Co-authored-by: Kamran Ahmed <kamranahmed.se@gmail.com>

content/roadmaps/107-nodejs/content/100-nodejs-introduction/100-what-is-nodejs.md

@@ -1 +1,10 @@
-# What is nodejs
+# What is Node.js
+
+Node.js is an open-source and cross-platform JavaScript runtime environment. It is a popular tool for almost any kind of project! Node.js runs the V8 JavaScript engine, Google Chrome's core, outside the browser. This allows Node.js to be very performant. A Node.js app runs in a single process, without creating a new thread for every request. Node.js provides a set of asynchronous I/O primitives in its standard library that prevent JavaScript code from blocking and generally, libraries in Node.js are written using non-blocking paradigms, making blocking behavior the exception rather than the norm.
+
+<ResourceGroupTitle>Free Content</ResourceGroupTitle>
+<BadgeLink colorScheme='blue' badgeText='Read' href='https://nodejs.org/en/about/'>Official Website</BadgeLink>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://www.w3schools.com/nodejs/nodejs_intro.asp'>Node.JS Introduction</BadgeLink>
+<BadgeLink colorScheme='green' badgeText='Read' href='https://nodejs.dev/en/learn/'>Official Website</BadgeLink>
+<BadgeLink badgeText='Watch' href='https://www.youtube.com/watch?v=uVwtVBpw7RQ'>What is Node.js?</BadgeLink>
+<BadgeLink badgeText='Watch' href='https://www.youtube.com/watch?v=jOupHNvDIq8'>How Node.js Works?</BadgeLink>