Establish a security policy file for all VMware GitHub repositories

[ericwb]

GitHub now has a feature whereby default community files can be set for all repos under an org using the special .github repo.

Tasks:

• Create .github repos for all organizations that VMware manages
• CODE_OF_CONDUCT.md
• SECURITY.md
• CONTRIBUTING.md

Creating a default community health file

[dstefka]

@avelichka I think this is completed now?

[avelichka]

The tasks are completed for: vmware, vmware-labs, vmware-samples, carbonblack, concourse, gemfire, pivotal-cf,
pivotal-cf-experimental, rabbitmq