Add more information about the usage of the commands

[vidya88]

@stdevIvr commented on Feb 16

The usage of the commands from the cli is not described in the help.

For example, if you type:

$ go run cli.go help emulatorWipe

you will see something like this:

USAGE:
        cli emulatorWipe [arguments...]

There is not enough information about the arguments of the commands.

[vidya88]

@stdevAlDen commented on Apr 30

@olemis, @therealssj milestone/release?