Add the Core Infrastructure Initiative Badge to README
# About
[![Docker Pulls](https://img.shields.io/docker/pulls/jenkins/jenkins.svg)](https://hub.docker.com/r/jenkins/jenkins/)
+[![CII Best Practices](https://bestpractices.coreinfrastructure.org/projects/3538/badge)](https://bestpractices.coreinfrastructure.org/projects/3538)
In a nutshell, Jenkins is the leading open-source automation server.
Built with Java, it provides over 1700 [plugins](https://plugins.jenkins.io/) to support automating virtually anything,
