Update readme.md

Add new Algorithm Platforms

Author: atulsemwal

README.md

@@ -284,6 +284,9 @@
         language you like. People use them as a speed contest, interview prep, company training, university coursework,
         practice problems, or to challenge each other.
       </li>
+       <li>
+        <a href="https://backtobackswe.com/" target="blank">Backtobackswe</a> - Backtobackswe platform is built to give a huge edge to the people by teaching the mind and intuition interviewers probe for. The goal of he platform is to make someone ready to pass software engineering interviews at "the big 4" companies and any other large tech companies.
+      </li>
     </ol>
   </details>
   <details open>