Update README.md

Author: SteveMacenski

README.md

@@ -20,6 +20,8 @@ For detailed instructions on how to:
 
 Please visit our [documentation site](https://navigation.ros.org/). [Please visit our community Slack here](https://join.slack.com/t/navigation2/shared_invite/zt-hu52lnnq-cKYjuhTY~sEMbZXL8p9tOw) (if this link does not work, please contact maintainers to reactivate).
 
+If you need professional services related to Nav2, please contact Open Navigation at [email protected].
+
 ## Our Sponsors
 
 Please thank our amazing sponsors for their generous support of Nav2 on behalf of the community to allow the project to continue to be professionally maintained, developed, and supported for the long-haul! [Open Navigation LLC](https://www.opennav.org/) provides project leadership, maintenance, development, and support services to the Nav2 & ROS community.