doc: extend README.md

Signed-off-by: Eduardo Montoya <[email protected]>

README.md

@@ -1,2 +1,38 @@
-# ncs-zigbee
-Zigbee nRF Connect add-on
+# Zigbee R23 Add-on for nRF Connect SDK (Experimental support)
+
+> **Note**
+> This is an initial and [experimental](https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/releases_and_maturity/software_maturity.html) release of Zigbee R23 support for Nordic Semiconductor’s nRF54L15 SoC. You can expect updates and enhancements in the future, including potential optimizations related to overall performance.
+
+The Zigbee R23 add-on for the nRF Connect SDK provides support for developing Zigbee applications based on the third-party precompiled ZBOSS stack. This stack is included as the ZBOSS Zigbee stack library. In combination with the nRF Connect SDK, the Zigbee R23 add-on allows for development of low-power connected solutions.
+
+## Getting started
+To get started with Zigbee R23 Add-on for nRF Connect SDK, follow [documentation](https://github.com/nrfconnect/ncs-zigbee).
+
+## Documentation
+Pre-build documentation is available [here](https://nrfconnect.github.io/ncs-zigbee).
+
+A minimal documentation setup is provided for Sphinx. To build the
+documentation first change to the ``docs`` folder:
+
+```shell
+cd docs
+```
+To install Sphinx, make sure you have a Python installation in place and run:
+
+```shell
+pip install -r requirements.txt
+```
+
+The Sphinx documentation (HTML) can be built using the following command:
+
+```shell
+make html
+```
+
+The output will be stored in the ``_build_sphinx`` folder. You may check for
+other output formats other than HTML by running ``make help``.
+
+
+##  License
+* Source code included within this repository is licensed under the [LicenseRef-Nordic-5-Clause](https://github.com/nrfconnect/ncs-zigbee/blob/main/LICENSE)
+* Pre-compiled ZBOSS libraries (`lib/zboss`) included within this repository are licensed under the [DSR Corporation License](https://github.com/nrfconnect/ncs-zigbee/blob/main/lib/zboss/license.txt)