docs: add Product Configuration Guidelines

Add a template for Product Configuration Guidelines that will be
filled soon.

Signed-off-by: Marta Rybczynska <marta.rybczynska@huawei.com>

docs/index.rst

@@ -29,6 +29,7 @@ Build System Guide
    ci/index
    supported-images
    hardware-support/index
+   Product Configuration Guidelines <product-guidelines>
 
 .. toctree::
    :caption: Supported Technologies

docs/product-guidelines.rst

+.. SPDX-FileCopyrightText: Huawei Inc.
+..
+.. SPDX-License-Identifier: CC-BY-4.0
+
+.. include:: definitions.rst
+
+.. _RepoWorkspace:
+
+Product Configuration Guidelines (WIP)
+######################################
+
+|main_project_name| provides images that can serve as a base for production
+images. We recommend, however, to review some defaults to fit with your
+product needs.
+
+.. contents:: 
+    :depth: 2
+
+Default User and Password
+*************************
+
+Content to be added here.