docs: updated readme (#1674)

Author: jjmachan

README.md

@@ -29,6 +29,8 @@
         <a href="https://docs.ragas.io/">Documentation</a> |
         <a href="#fire-quickstart">Quick start</a> |
         <a href="https://discord.gg/5djav8GGNZ">Join Discord</a> 
+        <a href="https://newsletter.ragas.io/">NewsLetter</a>
+        <a href="https://www.ragas.io/careers">Careers</a>
     <p>
 </h4>