Add link to roadmap.sh from repo header (#2760)

* added link in the header

* Update readme.md

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

readme.md

@@ -1,6 +1,6 @@
 <p align="center">
   <img src="public/brand.png" height="128">
-  <h2 align="center">roadmap.sh</h2>
+  <h2 align="center"><a href="https://roadmap.sh">roadmap.sh</a></h2>
   <p align="center">Community driven roadmaps, articles and resources for developers<p>
   <p align="center">
     <a href="https://roadmap.sh/roadmaps">