Update README.md (#2423)

Problem: README mentions that support is not available for NGF

Solution: This PR

* Update README.md

Update README to mention support.

* Update README.md

Thanks

Co-authored-by: Kate Osborn <50597707+kate-osborn@users.noreply.github.com>

* Update README.md

Updated with better language

---------

Co-authored-by: Kate Osborn <50597707+kate-osborn@users.noreply.github.com>

Author: mpstefan

README.md

@@ -135,6 +135,8 @@ If you have a use case for NGINX Gateway Fabric that the project can't quite mee
 
 Please read our [Contributing guide](CONTRIBUTING.md) if you'd like to contribute to the project.
 
-## Support
+## Support and NGINX Plus
 
-NGINX Gateway Fabric is not covered by any support contract.
+If your team needs dedicated support for NGINX Gateway Fabric in your environment, or you would like to leverage our [advanced NGINX Plus features](https://docs.nginx.com/nginx-gateway-fabric/overview/nginx-plus/), you can reach out [here](https://www.f5.com/content/f5-com/en_us/products/get-f5).
+
+To try NGINX Gateway Fabric with NGINX Plus, you can start your free [30-day trial](https://www.f5.com/trials), then follow the [installation guide](https://docs.nginx.com/nginx-gateway-fabric/installation/installing-ngf/helm/) for installing with NGINX Plus.