Add JavaScript data types links

* Update 102-javascript-datatypes

* Update readme.md

* Update content/roadmaps/106-javascript/content/102-javascript-datatypes/readme.md

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

content/roadmaps/106-javascript/content/102-javascript-datatypes/readme.md

@@ -1 +1,8 @@
-# Javascript datatypes
+# Datatypes
+
+Data type refers to the type of data that a JavaScript variable can hold. There are eight basic data types in JavaScript.
+
+<ResourceGroupTitle>Free Content</ResourceGroupTitle>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures'>JavaScript data types and data structures</BadgeLink>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://www.w3schools.com/js/js_datatypes.asp'>JavaScript Data Types</BadgeLink>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://javascript.info/types'>JavaScript Data Types</BadgeLink>