Added references to Eclipse Zenoh

Eclipse Zenoh provides a way to transparently scale ROS2 applications over the Internet as well as greatly reducing dynamic discovery traffic. It also allows for users to use the zenoh API to interact with any existing ROS2 application.

readme.md

@@ -117,6 +117,8 @@ The Robot Operating System 2 (ROS 2) is a set of software libraries and tools th
 - [Micro XRCE-DDS Agent docker](https://hub.docker.com/r/eprosima/micro-xrce-dds-agent/) - Docker image containing the Micro XRCE-DDS Agent.
 - [Micro XRCE-DDS Client](https://github.com/eProsima/Micro-XRCE-DDS-Client) - Micro XRCE-DDS implements a client-server protocol to enable resource-constrained devices (clients) to take part in DDS communications.
 - [micro-ROS-Agent](https://github.com/micro-ROS/micro-ROS-Agent) - ROS 2 package using Micro XRCE-DDS Agent.
+- [Eclipse Zenoh](https://github.com/eclipse-zenoh/zenoh) - [Zenoh](https://zenoh.io) is a scalable and extremely performant protocol that can be used transparently used to interact with [ROS2 applications](https://zenoh.io/blog/2021-04-28-ros2-integration/) as well as for [R2X communication](https://zenoh.io/blog/2021-03-23-discovery/).
+- [Eclipse Zenoh-Plugin-DDS](https://github.com/eclipse-zenoh/zenoh-plugin-dds) - This is a [zenoh](https://zenoh.io) plugin that allows to transparently route ROS2/DDS data over zenoh. This is commonly used for [R2X communication](https://zenoh.io/blog/2021-03-23-discovery/) over Wireless network or across the Internet. 
 
 ### "System" bindings