DOCSP-40539 Add Airbnb project to Example Projects (#3303)

## Pull Request Info - SDK Docs Consolidation

Jira ticket: https://jira.mongodb.org/browse/DOCSP-40539

*Staged Page*

- [Example
Projects](https://preview-mongodblindseymoore.gatsbyjs.io/realm/DOCSP-40539/example-projects/)


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source/example-projects.txt

@@ -192,6 +192,12 @@ Check out these supplementary projects to build on the power of the Atlas Device
       Use multiple realms to allow registered users to sync and manage movies in their own private list.
     - - `React Native <https://github.com/realm/realm-js/tree/main/examples/rn-multiple-realms>`__
 
+  * - Searchable Offline Collection
+    - Build an application that caches viewed collection items, so you can search and view them offline. 
+      This demo app uses listings from the
+      `Sample AirBnB Listings Dataset <https://www.mongodb.com/docs/atlas/sample-data/sample-airbnb/>`__. 
+    - - `React Native <https://github.com/realm/realm-js/tree/main/examples/rn-mbnb>`__
+
   * - Shared Whiteboard
     - Create a drawing app that demonstrates Realm mobile database and Atlas Device Sync.
     - - `Swift <https://github.com/realm/Realm-Drawing>`__