docs(react): Add React Router v7 docs (#11990)

Author: chargome

docs/platforms/javascript/guides/react/features/react-router.mdx

@@ -0,0 +1,22 @@
+---
+title: React Router
+description: "Learn about Sentry's React Router integration."
+---
+
+_(Available in version 5.21.0 and above)_
+
+React Router support is included in the `@sentry/react` package since version `5.21.0`.
+
+<Alert level="info" title="Note">
+
+The React Router integration is designed to work with Sentry Tracing. Please see [Set Up Tracing with React](/platforms/javascript/guides/react/tracing/) for more details on how to set up and install the SDK.
+
+</Alert>
+
+The React Router instrumentation uses the React Router library to create `pageload/navigation` transactions to ensure you collect meaningful performance data about the health of your page loads and associated requests.
+
+We support integrations for React Router 3, 4, 5, 6 and 7.
+
+
+
+<PageGrid />