DDOC-1079: Changelog entry for React 18 upgrade (#394)

* Add changelog for React 18 support

* Fix link

* Update date and blog link

* update feature in frontmatter

content/2024/07-16-react-18-buie.md

@@ -0,0 +1,28 @@
+---
+applied_at: '2024-07-17'
+applies_to:
+  - guides
+is_impactful: true
+is_new_feature: true
+release_source_url: ''
+collapse: true
+---
+
+# React 18 support for Box UI Elements
+
+[Box UI Elements][1] now support React 18, bringing a whole new level of flexibility and functionality for content collaboration in third-party apps.
+With this update, you can leverage the power of React 18’s cutting-edge features, drive innovation with latest front-end stack, while seamlessly integrating with the intelligent content cloud.
+
+<!-- more -->
+
+For details, read our [blog post][2].
+
+All customers and application owners who are potentially affected have been notified directly via email.
+
+## Where to get support
+
+Should you have any issues or need further guidance, please post a request to our [developer forum][2] for any help needed.
+
+[1]: g://embed/ui-elements
+[2]: https://medium.com/box-developer-blog/seamless-integration-box-ui-elements-and-react-18-compatibility-4db97a09ff01
+[3]: https://forum.box.com/