Added help msg on how to specify additional params
Added help msg on how to specify additional params

No help message available on how to specify additional params for an
action. So, added help message on how to create a volume for reference.

Signed-off-by: Vivek Dhayaal <1f5dced0ad1b46542e3f5f16d098508f39d52b74@gmail.com>

jiocloudservices/jcsclient