Update README with contribution guidelines

README.md

@@ -28,3 +28,17 @@ pinned: false
 <img src="https://raw.githubusercontent.com/mckinsey/vizro/main/.github/images/code_dashboard.png" width="1300"/>
 </p>
 
+
+<h2>✨ Contributing Demos and Showcasing Your Work ✨</h2>
+
+<ul style="list-style-type: none;">
+  <li>
+    <p>🎨 <strong>Showcase Your Vizro App:</strong> If you'd like us to feature your Vizro app on this page, 
+    <a href="https://github.com/mckinsey/vizro/issues/new/choose" target="_blank">please reach out to us on GitHub</a> 
+  </li>
+  <li>
+    <p>💡 <strong>Contribute to Our Demos:</strong> If you want to suggest changes or improvements to one of our demos, 
+    <a href="https://huggingface.co/docs/hub/repositories-pull-requests-discussions" target="_blank">we welcome your pull requests</a> 
+  </li>
+</ul>
+