docs: add link to new ROS2 community template (coder#20902)

Co-authored-by: Mathias Fredriksson <mafredri@gmail.com>

Author: 2 people

examples/templates/community-templates.md

@@ -33,6 +33,8 @@ templates.
   as coder workspaces on top of a Kubernetes cluster.
 - [raulsh/coder-proxmox-qemu-template](https://github.com/raulsh/coder-proxmox-qemu-template) -
   Proxmox QEMU template with VS code server for Coder.
+- [brtmax/coder-template-ros2](https://github.com/brtmax/coder-template-ros2) -
+  Template providing ROS2 robotics development environment.
 
 ## Automation