Add Rudder to Configuration Management (#551)

Co-authored-by: Ben Ranford <ben@rnfrd.dev>

README.md

@@ -159,6 +159,7 @@ _See also: [/r/chatops](https://old.reddit.com/r/chatops)*
 - [CFEngine](https://cfengine.com/) - Configuration management system for automated configuration and maintenance of large-scale computer systems. ([Source Code](https://github.com/cfengine/core)) `GPL-3.0` `C`
 - [Chef](https://www.chef.io/products/chef-infra) - Configuration management tool using a pure-Ruby, domain-specific language (DSL) for writing system configuration "recipes". ([Source Code](https://github.com/chef/chef)) `Apache-2.0` `Ruby`
 - [Puppet](https://www.puppet.com/) - Software configuration management tool which includes its own declarative language to describe system configuration. ([Source Code](https://github.com/puppetlabs/puppet)) `Apache-2.0` `Ruby/C`
+- [Rudder](https://www.rudder.io/) - Scalable and dynamic configuration management system for patching, security & compliance, based on CFEngine. ([Source Code](https://github.com/Normation/rudder)) `GPL-3.0` `Scala`
 - [Salt](https://docs.saltproject.io/) - Event-driven IT automation, remote task execution, and configuration management software. ([Source Code](https://github.com/saltstack/salt)) `Apache-2.0` `Python`