Update README to include VPU usage

Signed-off-by: Ron Evans <[email protected]>

README.md

@@ -106,6 +106,11 @@ To run the code using 16-bit floats, you have to both set the `-t` flag to use t
 
     ./monitor -m=/opt/intel/computer_vision_sdk/deployment_tools/intel_models/face-detection-adas-0001/FP16/face-detection-adas-0001.bin -c=/opt/intel/computer_vision_sdk/deployment_tools/intel_models/face-detection-adas-0001/FP16/face-detection-adas-0001.xml -pm=/opt/intel/computer_vision_sdk/deployment_tools/intel_models/head-pose-estimation-adas-0001/FP16/head-pose-estimation-adas-0001.bin -pc=/opt/intel/computer_vision_sdk/deployment_tools/intel_models/head-pose-estimation-adas-0001/FP16/head-pose-estimation-adas-0001.xml -b=2 -t=2
 
+To run the code using the VPU, you have to set the `-t` flag to `3` and also use the 16-bit FP16 version of the Intel® models:
+```
+    ./monitor -m=/opt/intel/computer_vision_sdk/deployment_tools/intel_models/face-detection-adas-0001/FP16/face-detection-adas-0001.bin -c=/opt/intel/computer_vision_sdk/deployment_tools/intel_models/face-detection-adas-0001/FP16/face-detection-adas-0001.xml -pm=/opt/intel/computer_vision_sdk/deployment_tools/intel_models/head-pose-estimation-adas-0001/FP16/head-pose-estimation-adas-0001.bin -pc=/opt/intel/computer_vision_sdk/deployment_tools/intel_models/head-pose-estimation-adas-0001/FP16/head-pose-estimation-adas-0001.xml -b=2 -t=3
+```
+
 ## Sample videos
 
 There are several videos available to use as sample videos to show the capabilities of this application. You can download them by running these commands from the `shopper-gaze-monitor` directory: