add info about VMware NSX-T CNI plugin (kubernetes#5987)

* add info about VMware NSX-T CNI plugin

Hello,

I'm VMware Networking and Security Architect and would like to include short information about our CNI plugin implementation similar to what other vendors did

Best regards

Emil Gagala

* Update networking.md

* Update networking.md

* Update networking.md

docs/concepts/cluster-administration/networking.md

@@ -190,6 +190,12 @@ Lars Kellogg-Stedman.
 
 Multus supports all [reference plugins](https://github.com/containernetworking/plugins) (eg. [Flannel](https://github.com/containernetworking/plugins/tree/master/plugins/meta/flannel), [DHCP](https://github.com/containernetworking/plugins/tree/master/plugins/ipam/dhcp), [Macvlan](https://github.com/containernetworking/plugins/tree/master/plugins/main/macvlan)) that implement the CNI specification and 3rd party plugins (eg. [Calico](https://github.com/projectcalico/cni-plugin), [Weave](https://github.com/weaveworks/weave), [Cilium](https://github.com/cilium/cilium), [Contiv](https://github.com/contiv/netplugin)). In addition to it, Multus supports [SRIOV](https://github.com/hustcat/sriov-cni), [DPDK](https://github.com/Intel-Corp/sriov-cni), [OVS-DPDK & VPP](https://github.com/intel/vhost-user-net-plugin) workloads in Kubernetes with both cloud native and NFV based applications in Kubernetes.
 
+### NSX-T
+
+[VMware NSX-T](https://docs.vmware.com/en/VMware-NSX-T/index.html) is a network virtualization and security platform. NSX-T can provide network virtualization for a multi-cloud and multi-hypervisor environment and is focused on emerging application frameworks and architectures that have heterogeneous endpoints and technology stacks. In addition to vSphere hypervisors, these environments include other hypervisors such as KVM, containers, and bare metal.
+
+[NSX-T Container Plug-in (NCP)](https://docs.vmware.com/en/VMware-NSX-T/2.0/nsxt_20_ncp_kubernetes.pdf) provides integration between NSX-T and container orchestrators such as Kubernetes, as well as integration between NSX-T and container-based CaaS/PaaS platforms such as Pivotal Container Service (PKS) and Openshift. 
+
 ### Nuage Networks VCS (Virtualized Cloud Services)
 
 [Nuage](http://www.nuagenetworks.net) provides a highly scalable policy-based Software-Defined Networking (SDN) platform. Nuage uses the open source Open vSwitch for the data plane along with a feature rich SDN Controller built on open standards.