Update 101-after-js.md added introduction and links (#1210)

* Update 101-after-js.md added introduction

* Update content/roadmaps/100-frontend/content/118-server-side-rendering/100-react-js/101-after-js.md

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

content/roadmaps/100-frontend/content/118-server-side-rendering/100-react-js/101-after-js.md

@@ -1 +1,7 @@
-# After js
+# After.js
+
+After.js is an open-source JavaScript framework for developing SSR (Server Side Rendering) based applications. It is similar to the Next.js framework for server-rendered React apps but uses React Router instead of a folder structure based router like Next.js
+
+<ResourceGroupTitle>Free Resources</ResourceGroupTitle>
+<BadgeLink colorScheme='blue' badgeText='GitHub' href='https://github.com/jaredpalmer/after.js'>Official GitHub repository</BadgeLink>
+<BadgeLink colorScheme='blue' badgeText='Docs' href='https://www.npmjs.com/package/@jaredpalmer/after'>Documetation</BadgeLink>