Add support to create and delete a job

Add support to download plugins

Add support to list the types of job

* Add more feature description and how to download on the linux os

* Use a simple cmd to download jcli

Fix the error with a proxy settings

* Add github setting

* Fix the suffix of settings

Fix the error when no crumb set

Fix the error of generate sample config file when no config file is exist

Add support to build a job with parameters

Show the progress of plugins installation

Add watch for job build log

Add search sub-cmd for plugin

Add user cmd