Add example get API version
Add example get API version

Getting the client API version is non-intuitive.
Other keys follow the json example or the version output, however `'{{.Client.ApiVersion}}'` does not work, nor does `'{{.Client.APIversion}}'`

Signed-off-by: Gabriel Gore <faf8c1cfe5762b022ef1299a64f9edfa12a9895a@cisco.com>
Signed-off-by: Sebastiaan van Stijn <64b2b6d12bfe4baae7dad3d018f8cbf6b0e7a044@gone.nl>

thaJeztah/cli,thaJeztah/cli,cpuguy83/cli,docker/cli,docker/cli,cpuguy83/cli