read me update

examples/light-switch-app/efr32/README.md

@@ -259,18 +259,21 @@ combination with JLinkRTTClient as follows:
 
     **Matter shell**
 
-        -   'switch on'    : Sends On command to bound device
+    **_OnOff Cluster_**
 
-        -   'switch off'   : Sends Off command to bound device
+        -  'switch onoff on'            : Sends unicast On command to bound device
+        -  'switch onoff off'           : Sends unicast Off command to bound device
+        -  'switch onoff toggle'        : Sends unicast Toggle command to bound device
 
-        -   'switch toggle : Sends Toggle command to bound device
+        -  'switch groups onoff on'     : Sends On group command to bound group
+        -  'switch groups onoff off'    : Sends On group command to bound group
+        -  'switch groups onoff toggle' : Sends On group command to bound group
 
 *   You can provision and control the Chip device using the python controller,
-    Chip tool standalone, Android or iOS app
-
     [CHIPTool](https://github.com/project-chip/connectedhomeip/blob/master/examples/chip-tool/README.md)
+    standalone, Android or iOS app
 
-    Here is an example with the CHIPTool:
+    Here is an example with the CHIPTool for unicast commands only:
 
     ```
     chip-tool pairing ble-thread 1 hex:<operationalDataset> 20202021 3840
@@ -280,6 +283,25 @@ combination with JLinkRTTClient as follows:
     chip-tool binding write binding '[{"fabricIndex": 1, "node": <lighting-node-id>, "endpoint": 1, "cluster":6}]' 1 1
     ```
 
+    Here is an example with the CHIPTool for groups commands only:
+
+    ```
+    chip-tool pairing ble-thread 1 hex:<operationalDataset> 20202021 3840
+
+    chip-tool tests TestGroupDemoConfig --nodeId 1
+
+    chip-tool tests TestGroupDemoConfig --nodeId <lighting-node-id>
+
+    chip-tool binding write binding '[{"fabricIndex": 1, "group": 257}]' 1 1
+    ```
+
+    To run the example with unicast and groups commands, run the grousp command
+    only commands and replace the last one with binding command
+
+    ```
+    chip-tool binding write binding '[{"fabricIndex": 1, "group": 257},{"fabricIndex": 1, "node": <lighting-node-id>, "endpoint": 1, "cluster":6} ]' 1 1
+    ```
+
 ### Notes
 
 -   Depending on your network settings your router might not provide native ipv6