Add content for Angular SSR (#2321)

* Added content to readme.md file of 113-angular-ssr

[#1847](https://github.com/kamranahmedse/developer-roadmap/issues/1847) I made the content addition to readme.md file of 113-angular-ssr folder to resolve the issue

* Update content/roadmaps/104-angular/content/113-angular-ssr/readme.md

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

content/roadmaps/104-angular/content/113-angular-ssr/readme.md

@@ -1 +1,6 @@
-# Angular ssr
+# SSR in Angular
+
+A normal Angular application executes in the browser, rendering pages in the DOM in response to user actions. Angular Universal executes on the server, generating static application pages that later get bootstrapped on the client. This means that the application generally renders more quickly, giving users a chance to view the application layout before it becomes fully interactive.
+
+<BadgeLink colorScheme='blue' badgeText='Official Docs' href='https://angular.io/guide/universal'>Angular Universal</BadgeLink>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://web.dev/rendering-on-the-web/'>Rendering on the Web</BadgeLink>