Proposal about Livy Client

[Jassy Wang]

Hi~
We proposed a new feature: Livy Client, which support to submit job with
shell. Detail information is here: LIVY-596
<https://issues.apache.org/jira/browse/LIVY-596?jql=project%20%3D%20LIVY> .
Could you please have a read and give some comment or feedback to us?
Thank you