Add build docs for Fabric-Admin and Fabric-Bridge-App (#34122)

* Add build doc for Fabric-Admin and Fabric-Bridge-App

* Update examples/fabric-admin/README.md

Co-authored-by: saurabhst <s.kumar9@samsung.com>

---------

Co-authored-by: saurabhst <s.kumar9@samsung.com>
Co-authored-by: Andrei Litvin <andy314@gmail.com>

Author: 3 people

docs/examples/index.md

@@ -85,6 +85,15 @@ darwin-framework-tool/README
 energy-management-app/**/README
 ```
 
+## Fabric Admin example
+
+```{toctree}
+:glob:
+:maxdepth: 1
+
+fabric-admin/README
+```
+
 ## Fabric Bridge example
 
 ```{toctree}

examples/fabric-admin/README.md

@@ -0,0 +1,53 @@
+# Matter Fabric Administrator Example
+
+An example application that supports synchronization of devices across fabrics
+fabrics.
+
+---
+
+-   [Building the Example Application](#building-the-example-application)
+
+---
+
+## Building the Example Application
+
+For Linux host example:
+
+```
+./scripts/examples/gn_build_example.sh examples/fabric-admin out/debug/standalone chip_config_network_layer_ble=false 'import("//with_pw_rpc.gni")'
+```
+
+For Raspberry Pi 4 example:
+
+### Pull Docker Images
+
+```
+docker pull connectedhomeip/chip-build-vscode:latest
+```
+
+### Run docker
+
+```
+docker run -it -v ~/connectedhomeip:/var/connectedhomeip connectedhomeip/chip-build-vscode:latest /bin/bash
+```
+
+### Build
+
+```
+cd /var/connectedhomeip
+
+git config --global --add safe.directory /var/connectedhomeip
+git config --global --add safe.directory /var/connectedhomeip/third_party/pigweed/repo
+git config --global --add safe.directory /var/connectedhomeip/examples/common/QRCode/repo
+
+./scripts/run_in_build_env.sh \
+ "./scripts/build/build_examples.py \
+    --target linux-arm64-fabric-admin-clang-rpc \
+    build"
+```
+
+### Transfer the fabric-admin binary to a Raspberry Pi
+
+```
+scp ./fabric-admin ubuntu@xxx.xxx.xxx.xxx:/home/ubuntu
+```

examples/fabric-bridge-app/linux/README.md

@@ -88,12 +88,45 @@ defined:
 
 -   Build the example application:
 
-    ```sh
-    cd ~/connectedhomeip/examples/fabric-bridge-app/linux
-    git submodule update --init
-    source third_party/connectedhomeip/scripts/activate.sh
-    gn gen out/debug
-    ninja -C out/debug
+    ### For Linux host example:
+
+    ```
+    ./scripts/examples/gn_build_example.sh examples/fabric-bridge-app/linux out/debug/standalone chip_config_network_layer_ble=false 'import("//with_pw_rpc.gni")'
+    ```
+
+    ### For Raspberry Pi 4 example:
+
+    Pull Docker Images
+
+    ```
+    docker pull connectedhomeip/chip-build-vscode:latest
+    ```
+
+    Run docker
+
+    ```
+    docker run -it -v ~/connectedhomeip:/var/connectedhomeip connectedhomeip/chip-build-vscode:latest /bin/bash
+    ```
+
+    Build
+
+    ```
+    cd /var/connectedhomeip
+
+    git config --global --add safe.directory /var/connectedhomeip
+    git config --global --add safe.directory /var/connectedhomeip/third_party/pigweed/repo
+    git config --global --add safe.directory /var/connectedhomeip/examples/common/QRCode/repo
+
+    ./scripts/run_in_build_env.sh \
+     "./scripts/build/build_examples.py \
+        --target linux-arm64-fabric-bridge-no-ble-clang-rpc \
+        build"
+    ```
+
+    Transfer the fabric-bridge-app binary to a Raspberry Pi
+
+    ```
+    scp ./fabric-bridge-app ubuntu@xxx.xxx.xxx.xxx:/home/ubuntu
     ```
 
 -   To delete generated executable, libraries and object files use:
@@ -116,4 +149,4 @@ defined:
     sudo out/debug/fabric-bridge-app
     ```
 
--   Test the device using ChipDeviceController on your laptop / workstation etc.
+-   Test the device using FabricAdmin on your laptop / workstation etc.