feat: add Set JavaScript content

content/roadmaps/106-javascript/content/104-javascript-data-structures/101-keyed-collections/102-set.md

@@ -1 +1,8 @@
-# Set
+# Set
+
+The `Set` object lets you store unique values of any type, whether [primitive](https://developer.mozilla.org/en-US/docs/Glossary/Primitive) values or object references. A value in the `Set` may only occur once; it is unique in the `Set`'s collection.
+
+<ResourceGroupTitle>Free Content</ResourceGroupTitle>
+
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set'>Set - JavaScript</BadgeLink>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://exploringjs.com/impatient-js/ch_sets.html'>Set - ExploringJS</BadgeLink>