docs: add frontend reference to setup section to README.md

Author: tom-weelborg

README.md

@@ -44,4 +44,6 @@ Tools like [Lombok](https://projectlombok.org/) are used to reduce boilerplate c
 5. Start Docker containers for database and Spring application:
     ```sh
     docker compose up -d
-    ```
+    ```
+   
+To use this project, it is advised to use the corresponding [Frontend](https://github.com/DevLink-dev/devlink-frontend-svelte).