Add gmsl_camera example

orbbec_camera/examples/gmsl_camera/README.MD

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+# GMSL_camera
+
+> This section describes how to use GMSL camera in OrbbecSDK_ROS2.Currently, only G335Lg GMSL devices are supported, and other GMSL devices will be supported in the near future.
+
+## Single GMSL camera
+
+The usage of GMSL camera in OrbbecSDK_ROS2 is the same as that of Gemini 330 series camera via USB.
+
+```bash
+ros2 launch orbbec_camera gemini_330_series.launch.py
+```
+
+## Multi GMSL camera
+
+To get the `usb_port` of the GMSL camera, plug in the camera and run the following command in the terminal:
+
+```bash
+ros2 run orbbec_camera list_devices_node
+```
+
+For example, the obtained gmsl camera `usb_port`: `gmsl2-1`
+
+Go to the [multi_camera.launch.py](../../launch/multi_camera.launch.py) file and change the `usb_port`.
+
+```bash
+ros2 launch orbbec_camera multi_camera.launch.py
+```
+
+## Multi GMSL camera synced
+
+First, please see how to use [multi_camera_synced](../multi_camera_synced/README.MD).
+
+In addition, GMSL multi-camera synced does not require Multi-Camera Sync Hub Pro, so there is no need to set the `primary` mode. Each GMSL camera is `secondary`.
+
+### Additional Parameter Settings
+
+gmsl_trigger_fps : set hardware soc trigger source frame rate.
+
+enable_gmsl_trigger : enable hardware soc trigger.
+
+### Run the launch
+
+Please refer to the configuration in [multi_gmsl_camera_synced.launch.py.](multi_gmsl_camera_synced.launch.py)
+
+```bash
+ros2 launch orbbec_camera multi_gmsl_camera_synced.launch.py
+```