Update README.md (#424)

Signed-off-by: Michael OReilly <[email protected]>

Author: michaeloreillyintel

README.md

@@ -3,6 +3,7 @@
 ![CodeQL](https://github.com/intel/userspace-cni-network-plugin/actions/workflows/codeql.yml/badge.svg?branch=main) 
 [![Go Report Card](https://goreportcard.com/badge/github.com/intel/userspace-cni-network-plugin)](https://goreportcard.com/report/github.com/intel/userspace-cni-network-plugin) 
 [![Go Reference](https://pkg.go.dev/badge/github.com/intel/userspace-cni-network-plugin.svg)](https://pkg.go.dev/github.com/intel/userspace-cni-network-plugin) 
+[![E2E](https://github.com/intel/userspace-cni-network-plugin/actions/workflows/e2e.yml/badge.svg)](https://github.com/intel/userspace-cni-network-plugin/actions/workflows/e2e.yml)
 [![OpenSSF Best Practices](https://www.bestpractices.dev/projects/7382/badge)](https://www.bestpractices.dev/projects/7382)
 
    * [Links](#links)