spark config identify command

There are a couple of users who got confused as to why their core was breathing cyan and connected to their own cloud but `spark list` showed no cores being online.

It turns out that the `spark config` command is useful but very often, they do not remember which profile they are currently on. Opened a similar issue to printout the current ip address but can't locate the github issue now..

I'm proposing to have a `spark config identify` kind of command to output the current profile being used and the data in the `.json` file.
removed unused variable for function
Merge branch 'patch-17' of github.com:kennethlimcp/spark-cli into kennethlimcp-patch-17
adding config list,  and more documentation
Merge branch 'kennethlimcp-patch-17'

Also adding config list, and more documentation