title: convert .pb model into quantized tflite model
body: <p>Totally new to Tensorflow,
  I have created one object detection model (.pb and .pbtxt) using 'faster_rcnn_inception_v2_coco_2018_01_28' model I found from TensorFlow zoo. It works fine on windows but I want to use this model on google coral edge TPU. How can I convert my frozen model into edgetpu.tflite quantized model?</p>