Creates a child folder within the Folder it is called from and returns the new Folder object.

        Args:
            folder_name: The name of the folder to create

        Returns: :class:`Folder <pyOutlook.core.folder.Folder>`

def create_child_folder(self, folder_name):
        """Creates a child folder within the Folder it is called from and returns the new Folder object.

        Args:
            folder_name: The name of the folder to create

        Returns: :class:`Folder <pyOutlook.core.folder.Folder>`
        """
        headers = self.headers
        endpoint = 'https://outlook.office.com/api/v2.0/me/MailFolders/' + self.id + '/childfolders'
        payload = '{ "DisplayName": "' + folder_name + '"}'

        r = requests.post(endpoint, headers=headers, data=payload)

        if check_response(r):
            return_folder = r.json()
            return self._json_to_folder(self.account, return_folder)