Add Cloud Foundry's CLI (`cf`) v6.2.0

The Cloud Foundry CLI is one command:  `cf`

The command enables the user to log into a Cloud Foundry
deployment and to make changes to services, brokers,
quotas, organizations, routes, etc....

The Cloud Foundry CLI is open source and written in Go.
Merge pull request #5176 from cunnie/cloudfoundry-cli

Add Cloud Foundry's CLI (`cf`) v6.2.0