Add Ankur Singh (@rush-skills) as a Contributor

Author: arm4b

OWNERS.md

@@ -51,6 +51,7 @@ Contributors are using and occasionally contributing back to the project, might
 They're not part of the TSC voting process, but appreciated for their contribution, involvement and may become Maintainers in the future depending on their effort and involvement. See [How to become a Maintainer?](https://github.com/StackStorm/st2/blob/master/GOVERNANCE.md#how-to-become-a-maintainer)
 [@StackStorm/contributors](https://github.com/orgs/StackStorm/teams/contributors) are invited to StackStorm Github organization and have permissions to help triage the Issues and review PRs.
 * Anand Patel ([@arms11](https://github.com/arms11)), _VMware_ - Docker, Kubernetes.
+* Ankur Singh ([@rush-skills](https://github.com/rush-skills)), _CERN_ - Puppet, Core, Docker, K8s.
 * Harsh Nanchahal ([@hnanchahal](https://github.com/hnanchahal)), _Starbucks_ - Core, Docker, Kubernetes.
 * Hiroyasu Ohyama ([@userlocalhost](https://github.com/userlocalhost)) - Orquesta, Workflows, st2 Japan Community. [Case Study](https://stackstorm.com/case-study-dmm/).
 * Sheshagiri Rao Mallipedhi ([@sheshagiri](https://github.com/sheshagiri)) - Docker, Core, StackStorm Exchange.