Add docs for logging

[ledex]

When space-cloud/pull/508 is merged, docs for the logging should be added.

[HeyItsJs]

Yeah @ledex, we would also have to figure out what all messages need to be logged at what level.

[ledex]

Yes @Jayesh333. You can find the provided log-levels in utils/loglevel.go. Currently there are DEBUG, INFO, WARNING and ERROR.

[HeyItsJs]

Yeah I will have a look at it @ledex.