update repo to new Chef OSS practices

In accordance with https://github.com/chef/chef-oss-practices/blob/master/repo-management/repo-states.md

* update README with project state and response times

Signed-off-by: Robb Kidd <robb@thekidds.org>

README.md

 Chef Workstation
 ==================================
 
-Chef Workstation installs everything you need to get started using Chef on Windows, Mac and Linux. 
+**Umbrella Project**: [Workstation](https://github.com/chef/chef-oss-practices/blob/master/projects/chef-workstation.md)
+
+* **[Project State](https://github.com/chef/chef-oss-practices/blob/master/repo-management/repo-states.md):** Active
+* **Issues [Response Time Maximum](https://github.com/chef/chef-oss-practices/blob/master/repo-management/repo-states.md):** 14 days
+* **Pull Request [Response Time Maximum](https://github.com/chef/chef-oss-practices/blob/master/repo-management/repo-states.md):** 14 days
+
+Chef Workstation installs everything you need to get started using Chef on Windows, Mac and Linux.
 It includes:
 - chef-run, a new tool for executing ad-hoc tasks against your servers
 - ChefDK, all the tools you know and love