docs/open-thread: Overview of OpenThread

Definition of OpenThread
Advantages
OpenThread Border Router to connect to internet
This closes: OSTC/planning/core-os#13

Signed-off-by: shettygururaj <gururaj.shetty@huawei.com>

docs/os/index.rst

@@ -12,3 +12,4 @@ details various aspects for each kernel type.
    :maxdepth: 2
 
    linux/index
+   supported-technologies/index

docs/os/supported-technologies/index.rst

+.. SPDX-FileCopyrightText: Huawei Inc.
+..
+.. SPDX-License-Identifier: CC-BY-4.0
+
+.. _SupportedTechnologies:
+
+Supported Technologies
+######################
+
+This section details the supported technologies in All Scenarios OS.
+
+.. toctree::
+   :maxdepth: 1
+   
+   openthread

docs/os/supported-technologies/openthread.rst

+.. SPDX-FileCopyrightText: Huawei Inc.
+..
+.. SPDX-License-Identifier: CC-BY-4.0
+
+OpenThread
+##########
+
+OpenThread is an open-source implementation of the Thread networking protocol
+based on IPv6. It is designed for low-powered devices that operate in a mesh
+network based on the IEEE 802.15.4 standards.
+Some of the main advantages of implementing OpenThread are:
+
+* Simple to install and operate.
+* Mandatory authentication of devices.
+* All communications are encrypted.
+* Self-healing mechanism with no single point of failure in a mesh network.
+* Support for low-powered devices.
+* Scalable up to hundreds of devices.
+
+For more details on OpenThread, `Click <https://openthread.io/guides/thread-primer>`__.
+
+Connecting to Internet
+**********************
+
+You can connect the Thread network to the internet using the Thread Border Router. 
+The Thread Border Router is an open-source implementation provided by the 
+OpenThread community. 
+For instructions on how to set up a Border Router, `Click <https://openthread.io/guides/border-router>`__.