Added basic documentation of nodecg.json file.
Added basic documentation of nodecg.json file.

IgorCandido/igrcnddStreamNotifications,nodecg/nodecg,nodecg/nodecg,IgorCandido/igrcnddStreamNotifications,madmatt/nodecg,nseckinoral/nodecg,nodecg/nodecg,nseckinoral/nodecg,madmatt/nodecg