Creates new users from values provided in args parameter as stringified JSON

The value that can be included in args are:

'full_name': { 'required': true, 'type': 'String' },// name of the user

'username': { 'required': true, 'type': 'String' },// username of the user

'password': { 'required': true, 'type': 'String' }, //user's password

'email': { 'required': true, 'type': 'String' },// user's email

'admin_of': { 'required': false, 'type': 'Array' },// list of apps which user will be admin of

'user_of': { 'required': false, 'type': 'Array' }, //list of apps which user will be user of

'global_admin': { 'required': false, 'type': 'Boolean' }// is user a global admin