[Realtek] Update README

Author: pankore

examples/light-switch-app/realtek_bee/README.md

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+# Matter BEE4 Light Switch Example Application
 
-# Matter BEE4 SDK
+This reference application implements an light switch device type. You can use
+this example as a reference for creating your own application.
 
-## Realtek SDK
+The example is based on:
 
-More detailed information on the Bee4 SDK can be found in the
-[Realtek Matter SDK](https://github.com/rtkconnectivity/rtl87x2g_sdk).
+-   [Matter](https://github.com/project-chip/connectedhomeip)
+-   [BEE4 github SDK](https://github.com/rtkconnectivity/rtl87x2g_sdk)
+-   [OT-REALTEK](https://github.com/rtkconnectivity/ot-realtek)
+
+## Supported devices
+
+-   [RTL8777G]
+
+## Introduction
+
+The application showcases a light switch device that communicates with clients
+over a low-power, 802.15.4 Thread network.
+
+It can be commissioned into an existing Matter network using a controller such
+as `chip-tool`.
+
+This example implements a `Standard commissioning flow`, meaning devices not
+connected to the network automatically broadcast advertising when powered on.
+The initial commissioning is done through `ble-thread` pairing method.
+
+The Thread network dataset will be transferred on the device using a secure
+session over Bluetooth LE.To pair successfully, the commissioner must know the
+commissioning information corresponding to the device: setup passcode and
+discriminator. This data is usually encoded within a QR code or printed to the
+UART console.
+
+## Prerequisites for building
+
+In order to build the example, it is recommended to use a Linux distribution.
+Please visit the supported Operating Systems list in
+[BUILDING.md](../../../docs/guides/BUILDING.md#prerequisites).
+
+-   Make sure that below prerequisites are correctly installed (as described in
+    [BUILDING.md](../../../docs/guides/BUILDING.md#prerequisites))
+
+```
+sudo apt-get install git gcc g++ pkg-config libssl-dev libdbus-1-dev libglib2.0-dev libavahi-client-dev ninja-build python3-venv python3-dev python3-pip unzip libgirepository1.0-dev libcairo2-dev libreadline-dev
+```
+
+-   Step 1: checkout Realtek specific submodules only
+
+    ```
+    user@ubuntu:~/Desktop/git/connectedhomeip$ scripts/checkout_submodules.py --shallow --platform realtek_bee --recursive
+    ```
+
+-   Step 1: Init REALTEK SDK
+
+    ```
+    cd ./third_party/openthread/ot-realtek
+    user@ubuntu:~/Desktop/git/connectedhomeip/third_party/openthread/ot-realtek$ git submodule update --init --recursive
+    ```
+
+-   Step 3: activate local environment
+
+    ```
+    user@ubuntu:~/Desktop/git/connectedhomeip$ source scripts/activate.sh
+    ```
+
+    If the script says the environment is out of date, you can update it by
+    running the following command:
+
+    ```
+    user@ubuntu:~/Desktop/git/connectedhomeip$ source scripts/bootstrap.sh
+    ```
+
+## Building
+
+    user@ubuntu:~/Desktop/git/connectedhomeip$ cd ./third_party/openthread/ot-realtek
+    user@ubuntu:~/Desktop/git/connectedhomeip/third_party/openthread/ot-realtek$ OT_CMAKE_NINJA_TARGET="matter-cli-mtd" ./Realtek/build bee4 sdk rtl8777g light-switch-app
 
 ## More information