Update README.md

Author: jelveh

README.md

@@ -8,6 +8,8 @@
     <br />
     <a href="https://puter.com/?ref=github.com">Puter.com</a>
     ·
+    <a href="https://puter.com/app/app-center">App Store</a>
+    ·
     <a href="https://docs.puter.com" target="_blank">SDK</a>
     ·
     <a href="https://github.com/heyputer/puter-cli" target="_blank">CLI</a>