Add examples of inspect cmd

[kobayashi]

Adding examples of usage Go template for command ignite inspect. The example commands are from #587

Example usage:
        $ ignite inspect vm my-vm

        $ ignite inspect vm my-vm -t {{.Status.IPAddresses}}

        $ ignite inspect vm my-vm -t {{.ObjectMeta.Name}}

        $ ignite inspect vm my-vm -t {{.Spec.Image.OCI}}

related: #589

[darkowlzz]

LGTM! Thanks.
Since this command can be used to inspect image and kernel kinds as well, maybe we should have one example for them too.