Update benchmark README.MD in examples

orbbec_camera/examples/benchmark/README.MD

@@ -1 +1,53 @@
+# ob_benchmark tool
 
+> The goal of this tool is to benchmark the performance of various OrbbecSDK_ROS2 camera configurations. The benchmark results depend on the camera and settings used.
+
+## Usage Instructions
+
+### Tool Configuration (start_benchmark_params.json)
+
+```json
+{
+    "start_benchmark_params": {
+        "camera_name": [
+            "camera_01",
+            "camera_02",
+            "camera_03",
+            "camera_04"
+        ],
+        "process_name": "component_conta",
+        "switch_cycle": 300,
+        "test_cycle": 1,
+        "skip_number": 30
+    }
+}
+
+```
+
+* `camera_name`: Names of the cameras to be configured. Example: `"camera_01"`, `"camera_02"`, etc.
+* `process_name`: The name of the process to be monitored. For example, `"component_conta"` will monitor the data of the container process.
+
+* `switch_cycle`: The cycle time for switching configurations, in seconds. For example, setting it to `300` means the configuration will switch every 300 seconds.
+* `test_cycle`: The testing cycle, in seconds. For example, setting it to `1` means the tool will collect data for the monitored process every 1 second.
+
+* `skip_number`: The number of data points to skip. For example, setting it to `30` means that the first 30 data points will be ignored.
+
+### Camera configuration (launch files)
+
+In the launch folder, there are multiple\.launch.py files (`ob_benchmark_0.launch.py`, `ob_benchmark_1.launch.py`, ..., `ob_benchmark_19.launch.py`). Each file corresponds to a different camera configuration.
+
+### Running the ob_benchmark tool
+
+To run the tool, use the following commands:
+
+```bash
+source install/setup.bash
+ros2 run orbbec_camera ob_benchmark_node
+```
+
+### Output Data Files
+
+The output data files will be stored in the ob_benchmark folder with filenames like `0.csv`, `1.csv`, ..., 19.csv. For example:
+
+* `0.csv` contains data from the `ob_benchmark_0.launch.py` configuration.
+* `1.csv` contains data from the `ob_benchmark_1.launch.py` configuration.