Add Chat's React Native getting started guide

Author: GregHolmes

src/data/nav/chat.ts

@@ -32,6 +32,10 @@ export default {
               name: 'React',
               link: '/docs/chat/getting-started/react',
             },
+            {
+              name: 'React Native',
+              link: '/docs/chat/getting-started/react-native',
+            },
             {
               name: 'Kotlin',
               link: '/docs/chat/getting-started/kotlin',