• 'cookie' The user cookie that creates the group.
• key – get API key from Settings > User Plus

• 'name'
  (string) The group name.
• 'description'
  (string) Optional. The group's description.
• 'slug'
  (string) The group slug.
• 'status'
  (string) The group's status. Accepts 'public', 'private' or 'hidden'. Defaults to 'public'.
• 'parent_id'
  (int) The ID of the parent group. Default: 0.
• 'enable_forum'
  (int) Optional. Whether the group has a forum enabled. If a bbPress forum is enabled for the group, set this to 1. Default: 0.
• 'date_created'
  (string) The GMT time, in Y-m-d h:i:s format, when the group was created. Defaults to the current time.

The ID of the group on success. False on error.