AddPage.
        [Preview API] Adds a page to the work item form.
        :param :class:`<Page> <azure.devops.v5_0.work_item_tracking_process.models.Page>` page: The page.
        :param str process_id: The ID of the process.
        :param str wit_ref_name: The reference name of the work item type.
        :rtype: :class:`<Page> <azure.devops.v5_0.work_item_tracking_process.models.Page>`

def add_page(self, page, process_id, wit_ref_name):
        """AddPage.
        [Preview API] Adds a page to the work item form.
        :param :class:`<Page> <azure.devops.v5_0.work_item_tracking_process.models.Page>` page: The page.
        :param str process_id: The ID of the process.
        :param str wit_ref_name: The reference name of the work item type.
        :rtype: :class:`<Page> <azure.devops.v5_0.work_item_tracking_process.models.Page>`
        """
        route_values = {}
        if process_id is not None:
            route_values['processId'] = self._serialize.url('process_id', process_id, 'str')
        if wit_ref_name is not None:
            route_values['witRefName'] = self._serialize.url('wit_ref_name', wit_ref_name, 'str')
        content = self._serialize.body(page, 'Page')
        response = self._send(http_method='POST',
                              location_id='1cc7b29f-6697-4d9d-b0a1-2650d3e1d584',
                              version='5.0-preview.1',
                              route_values=route_values,
                              content=content)
        return self._deserialize('Page', response)