Added content to readme.md file of 106-javascript. (#2551)

* Added content to readme.md file of 106-javascript.

(#1838) [https://github.com/kamranahmedse/developer-roadmap/issues/1838]  I resolved this issue by adding the content. Please look into my PR!!

* Update content/roadmaps/106-javascript/content/readme.md

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

content/roadmaps/106-javascript/content/readme.md

@@ -1 +1,18 @@
-# 
+<DedicatedRoadmap
+  href='/javascript'
+  title='JavaScript Roadmap'
+  description='Click to check the detailed JavaScript Roadmap.'
+/>
+
+# JavaScript
+
+JavaScript allows you to add interactivity to your pages. Common examples that you may have seen on the websites are sliders, click interactions, popups and so on. Apart from being used on the frontend in browsers, there is Node.js which is an open-source, cross-platform, back-end JavaScript runtime environment that runs on the V8 engine and executes JavaScript code outside a web browser.
+
+<ResourceGroupTitle>Free Content</ResourceGroupTitle>
+
+<BadgeLink badgeText='Read' colorScheme="yellow" href='https://www.w3schools.com/js/'>W3Schools – JavaScript Tutorial</BadgeLink>
+<BadgeLink badgeText='Read' colorScheme="yellow" href='https://javascript.info/'>The Modern JavaScript Tutorial</BadgeLink>
+<BadgeLink badgeText='Course' colorScheme='green' href='https://www.codecademy.com/learn/introduction-to-javascript'>Codecademy - Learn JavaScript</BadgeLink>
+<BadgeLink badgeText='Watch' href='https://youtu.be/hdI2bqOjy3c'>JavaScript Crash Course for Beginners</BadgeLink>
+<BadgeLink badgeText='Watch' href='https://www.youtube.com/watch?v=fBNz5xF-Kx4'>Node.js Crash Course</BadgeLink>
+<BadgeLink badgeText='Watch' href='https://www.youtube.com/watch?v=TlB_eWDSMt4'>Node.js Tutorial for Beginners</BadgeLink>